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Tutoring abilities

In the 1840s, a single water mold wiped out Ireland's potato crop, causing a devastating famine because every farm grew the exact same genetic clone. If all living things in a population are identical, a single threat can destroy them all.

**Biodiversity** is the total variety of all life on Earth, and scientists evaluate it across three distinct levels: **genetic**, **species**, and **ecosystem** diversity.

What makes individuals of the same species different from one another beneath the surface?

**Genetic diversity** refers to the total variety of genes and **alleles**—different versions of the same gene—within a single species or population.

A population with high genetic diversity has a wide range of inherited traits, which gives it a much better chance of surviving environmental changes or novel diseases.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .diagram-stage {
      width: 100%;
      max-width: 540px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .nav-bar {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 8px;
      background: #eef2f6;
      padding: 4px;
      border-radius: 10px;
    }

    .nav-btn {
      border: none;
      background: transparent;
      padding: 8px 4px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      color: #6b7280;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
    }

    .nav-btn.active {
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    }

    .nav-btn:hover {
      color: #0f172a;
    }

    .display-area {
      position: relative;
      height: 280px;
      background: #ffffff;
      border-radius: 14px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      border: 1px solid #e5e7eb;
    }

    .view-panel {
      position: absolute;
      inset: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.35s ease, transform 0.35s ease;
      transform: scale(0.96);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 16px;
    }

    .view-panel.active {
      opacity: 1;
      pointer-events: auto;
      transform: scale(1);
    }

    .tag-badge {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 14px;
      background: #f1f5f9;
      color: #475569;
    }

    /* Genetic View */
    .genetic-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      width: 100%;
      max-width: 360px;
    }

    .trait-card {
      background: #f8fafc;
      border-radius: 10px;
      padding: 10px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      border: 1px solid #e2e8f0;
      transition: transform 0.2s ease;
    }

    .trait-icon {
      font-size: 32px;
      line-height: 1;
    }

    .dna-indicator {
      width: 22px;
      height: 6px;
      border-radius: 3px;
    }

    /* Species View */
    .species-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      width: 100%;
      max-width: 380px;
    }

    .species-item {
      background: #f0fdf4;
      border-radius: 10px;
      padding: 10px 4px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      border: 1px solid #dcfce7;
      font-size: 30px;
    }

    /* Ecosystem View */
    .eco-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      width: 100%;
      max-width: 420px;
    }

    .eco-card {
      background: #f0f9ff;
      border-radius: 10px;
      padding: 12px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      border: 1px solid #e0f2fe;
    }

    .eco-icons {
      display: flex;
      align-items: center;
      gap: 2px;
      font-size: 24px;
    }

    .zoom-hint {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 12px;
      color: #94a3b8;
      font-weight: 500;
    }

    .scale-bar {
      display: flex;
      align-items: center;
      gap: 6px;
      width: 120px;
      height: 4px;
      background: #e2e8f0;
      border-radius: 2px;
      overflow: hidden;
    }

    .scale-fill {
      height: 100%;
      background: #22b7ff;
      transition: width 0.35s ease;
    }
  </style>
</head>
<body>

  <div class="diagram-stage">
    <div class="nav-bar">
      <button class="nav-btn active" data-idx="0">🧬 Genetic</button>
      <button class="nav-btn" data-idx="1">🦊 Species</button>
      <button class="nav-btn" data-idx="2">🏞️ Ecosystem</button>
    </div>

    <div class="display-area">
      
      <div class="view-panel active" id="panel-0">
        <div class="tag-badge" style="background:#eff6ff; color:#1d4ed8;">1 Species · Varied Traits</div>
        <div class="genetic-grid">
          <div class="trait-card">
            <span class="trait-icon">🐞</span>
            <div class="dna-indicator" style="background:#ef4444;"></div>
          </div>
          <div class="trait-card">
            <span class="trait-icon" style="filter: hue-rotate(90deg);">🐞</span>
            <div class="dna-indicator" style="background:#22c55e;"></div>
          </div>
          <div class="trait-card">
            <span class="trait-icon" style="filter: hue-rotate(200deg);">🐞</span>
            <div class="dna-indicator" style="background:#3b82f6;"></div>
          </div>
          <div class="trait-card">
            <span class="trait-icon" style="filter: hue-rotate(280deg);">🐞</span>
            <div class="dna-indicator" style="background:#a855f7;"></div>
          </div>
        </div>
      </div>

      
      <div class="view-panel" id="panel-1">
        <div class="tag-badge" style="background:#f0fdf4; color:#15803d;">1 Community · Varied Species</div>
        <div class="species-grid">
          <div class="species-item">🦊</div>
          <div class="species-item">🦉</div>
          <div class="species-item">🐸</div>
          <div class="species-item">🐞</div>
          <div class="species-item">🌳</div>
          <div class="species-item">🍄</div>
          <div class="species-item">🌸</div>
          <div class="species-item">🐝</div>
        </div>
      </div>

      
      <div class="view-panel" id="panel-2">
        <div class="tag-badge" style="background:#f0f9ff; color:#0369a1;">1 Region · Varied Habitats</div>
        <div class="eco-grid">
          <div class="eco-card">
            <div class="eco-icons">🌲🦉</div>
          </div>
          <div class="eco-card">
            <div class="eco-icons">🌊🐠</div>
          </div>
          <div class="eco-card">
            <div class="eco-icons">🌾🦊</div>
          </div>
          <div class="eco-card">
            <div class="eco-icons">🏔️🦅</div>
          </div>
          <div class="eco-card">
            <div class="eco-icons">🏖️🦀</div>
          </div>
          <div class="eco-card">
            <div class="eco-icons">🏜️🦎</div>
          </div>
        </div>
      </div>
    </div>

    <div class="zoom-hint">
      <span>Zoom</span>
      <div class="scale-bar">
        <div class="scale-fill" id="scaleFill" style="width: 33%;"></div>
      </div>
    </div>
  </div>

  <script>
    const btns = document.querySelectorAll('.nav-btn');
    const panels = document.querySelectorAll('.view-panel');
    const scaleFill = document.getElementById('scaleFill');
    let currentIndex = 0;
    let autoTimer = null;

    function setView(idx) {
      currentIndex = idx;
      btns.forEach((btn, i) => btn.classList.toggle('active', i === idx));
      panels.forEach((p, i) => p.classList.toggle('active', i === idx));
      const widths = ['33%', '66%', '100%'];
      scaleFill.style.width = widths[idx];
    }

    btns.forEach(btn => {
      btn.addEventListener('click', () => {
        clearInterval(autoTimer);
        setView(parseInt(btn.dataset.idx, 10));
      });
    });

    // Auto-cycle through levels calmly
    autoTimer = setInterval(() => {
      currentIndex = (currentIndex + 1) % 3;
      setView(currentIndex);
    }, 3800);
  </script>
</body>
</html>

When you zoom out from individuals of one species to all the different organisms living together in a habitat, what changes?

**Species diversity** measures both **species richness** (the total number of different species in a community) and **species evenness** (the relative abundance of each species).

A forest with 10 oak trees, 10 pines, and 10 birches has greater species diversity than a forest with 28 oaks, 1 pine, and 1 birch, even though both have a richness of 3 species.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      background: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      gap: 10px;
    }

    .nav-tabs {
      display: flex;
      width: 100%;
      max-width: 480px;
      background: #e9ecef;
      padding: 4px;
      border-radius: 12px;
      gap: 4px;
    }

    .tab-btn {
      flex: 1;
      border: none;
      background: transparent;
      padding: 8px 4px;
      font-size: 13px;
      font-weight: 600;
      color: #6b7280;
      border-radius: 8px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    }

    .tab-btn.active {
      background: #ffffff;
      color: #1e2945;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    }

    .stage-container {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 250px;
      background: #ffffff;
      border-radius: 16px;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
      border: 1px solid #e5e7eb;
      overflow: hidden;
    }

    .view-panel {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      padding: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }

    .view-panel.active {
      opacity: 1;
      pointer-events: auto;
    }

    /* Genetic View */
    .genetic-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 380px;
    }

    .specimen-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px 4px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }

    .ladybug-icon {
      font-size: 28px;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.06));
    }

    .dna-code {
      font-family: monospace;
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
    }

    .allele-a { background: #dbeafe; color: #1e40af; }
    .allele-b { background: #fce7f3; color: #9d174d; }
    .allele-c { background: #fef3c7; color: #92400e; }
    .allele-d { background: #dcfce7; color: #166534; }

    /* Species View */
    .species-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
      max-width: 380px;
    }

    .species-item {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .species-item span:first-child {
      font-size: 30px;
    }

    .count-badge {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      background: #edf2f7;
      padding: 2px 8px;
      border-radius: 10px;
    }

    /* Ecosystem View */
    .ecosystem-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
      width: 100%;
      max-width: 380px;
    }

    .eco-card {
      border-radius: 12px;
      padding: 12px 8px;
      display: flex;
      align-items: center;
      gap: 10px;
      border: 1px solid rgba(0,0,0,0.06);
    }

    .eco-card .icon {
      font-size: 26px;
    }

    .eco-1 { background: #ecfdf5; color: #065f46; }
    .eco-2 { background: #eff6ff; color: #1e40af; }
    .eco-3 { background: #fefce8; color: #854d0e; }
    .eco-4 { background: #faf5ff; color: #6b21a8; }

    /* Scale hierarchy bar */
    .scale-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 480px;
      background: #ffffff;
      padding: 8px 14px;
      border-radius: 10px;
      border: 1px solid #e5e7eb;
      font-size: 12px;
      font-weight: 600;
      color: #6b7280;
    }

    .scale-arrow {
      color: #22b7ff;
      font-size: 14px;
    }

    .scale-step.active {
      color: #22b7ff;
      font-weight: 700;
    }
  </style>
</head>
<body>

  
  <div class="nav-tabs">
    <button class="tab-btn active" id="tab0" onclick="setStep(0)">🧬 Genetic</button>
    <button class="tab-btn" id="tab1" onclick="setStep(1)">🦊 Species</button>
    <button class="tab-btn" id="tab2" onclick="setStep(2)">🏞️ Ecosystem</button>
  </div>

  
  <div class="stage-container">
    
    
    <div class="view-panel active" id="panel0">
      <div class="genetic-grid">
        <div class="specimen-card">
          <span class="ladybug-icon" style="filter: hue-rotate(0deg);">🐞</span>
          <span class="dna-code allele-a">A₁ A₁</span>
        </div>
        <div class="specimen-card">
          <span class="ladybug-icon" style="filter: hue-rotate(90deg);">🐞</span>
          <span class="dna-code allele-b">A₁ A₂</span>
        </div>
        <div class="specimen-card">
          <span class="ladybug-icon" style="filter: hue-rotate(180deg);">🐞</span>
          <span class="dna-code allele-c">A₂ A₂</span>
        </div>
        <div class="specimen-card">
          <span class="ladybug-icon" style="filter: hue-rotate(270deg);">🐞</span>
          <span class="dna-code allele-d">A₂ A₃</span>
        </div>
      </div>
    </div>

    
    <div class="view-panel" id="panel1">
      <div class="species-grid">
        <div class="species-item">
          <span>🌲</span>
          <span class="count-badge">10×</span>
        </div>
        <div class="species-item">
          <span>🦊</span>
          <span class="count-badge">4×</span>
        </div>
        <div class="species-item">
          <span>🦉</span>
          <span class="count-badge">6×</span>
        </div>
        <div class="species-item">
          <span>🍄</span>
          <span class="count-badge">12×</span>
        </div>
        <div class="species-item">
          <span>🌸</span>
          <span class="count-badge">15×</span>
        </div>
        <div class="species-item">
          <span>🐸</span>
          <span class="count-badge">8×</span>
        </div>
      </div>
    </div>

    
    <div class="view-panel" id="panel2">
      <div class="ecosystem-grid">
        <div class="eco-card eco-1">
          <span class="icon">🌲</span>
          <strong>Forest</strong>
        </div>
        <div class="eco-card eco-2">
          <span class="icon">🌊</span>
          <strong>River</strong>
        </div>
        <div class="eco-card eco-3">
          <span class="icon">🌾</span>
          <strong>Grassland</strong>
        </div>
        <div class="eco-card eco-4">
          <span class="icon">🏔️</span>
          <strong>Mountain</strong>
        </div>
      </div>
    </div>

  </div>

  
  <div class="scale-bar">
    <span class="scale-step active" id="scale0">1 Species</span>
    <span class="scale-arrow">→</span>
    <span class="scale-step" id="scale1">1 Community</span>
    <span class="scale-arrow">→</span>
    <span class="scale-step" id="scale2">1 Landscape</span>
  </div>

  <script>
    let currentStep = 0;

    function setStep(idx) {
      currentStep = idx;
      for (let i = 0; i < 3; i++) {
        document.getElementById(`tab${i}`).classList.toggle('active', i === idx);
        document.getElementById(`panel${i}`).classList.toggle('active', i === idx);
        document.getElementById(`scale${i}`).classList.toggle('active', i === idx);
      }
    }
  </script>
</body>
</html>

How do multiple communities interact with non-living landforms and climates across an entire geographic region?

**Ecosystem diversity** encompasses the variety of distinct habitats, biological communities, and ecological processes occurring across a broad geographic area.

A coastline containing salt marshes, sandy beaches, mangrove forests, and coral reefs supports far more ecological niches than a uniform, uninterrupted sandy shoreline.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }

    .nav-bar {
      display: flex;
      gap: 6px;
      width: 100%;
      max-width: 480px;
      margin-bottom: 12px;
    }

    .nav-btn {
      flex: 1;
      border: 1px solid #e2e8f0;
      background: #ffffff;
      padding: 8px 4px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      transition: all 0.25s ease;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    }

    .nav-btn .icon {
      font-size: 16px;
    }

    .nav-btn.active {
      background: #ffffff;
      color: #0284c7;
      border-color: #22b7ff;
      box-shadow: 0 0 0 2px #22b7ff22, 0 2px 4px rgba(0,0,0,0.06);
    }

    .stage-container {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 280px;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      overflow: hidden;
    }

    .view-panel {
      position: absolute;
      inset: 0;
      padding: 16px;
      display: grid;
      align-content: center;
      justify-content: center;
      gap: 12px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }

    .view-panel.active {
      opacity: 1;
      pointer-events: auto;
    }

    /* Ecosystem Level */
    .eco-grid {
      grid-template-columns: repeat(2, 1fr);
      grid-template-rows: repeat(2, 1fr);
      width: 100%;
      height: 100%;
    }

    .eco-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 4px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
    }

    .eco-card span.emoji {
      font-size: 28px;
    }

    /* Species Level */
    .species-grid {
      grid-template-columns: repeat(3, 1fr);
      grid-template-rows: repeat(2, 1fr);
      width: 100%;
      height: 100%;
    }

    .species-card {
      background: #f0f9ff;
      border: 1px solid #bae6fd;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
      font-size: 12px;
      font-weight: 500;
      color: #0369a1;
    }

    .species-card span.emoji {
      font-size: 26px;
    }

    /* Genetic Level */
    .genetic-grid {
      grid-template-columns: repeat(3, 1fr);
      grid-template-rows: repeat(2, 1fr);
      width: 100%;
      height: 100%;
    }

    .gene-card {
      background: #faf5ff;
      border: 1px solid #e9d5ff;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 4px;
      position: relative;
    }

    .gene-card span.emoji {
      font-size: 28px;
      transition: filter 0.3s ease;
    }

    .dna-tag {
      font-size: 10px;
      font-family: monospace;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
      background: #f3e8ff;
      color: #7e22ce;
    }

    .v1 span.emoji { filter: hue-rotate(0deg); }
    .v2 span.emoji { filter: hue-rotate(90deg); }
    .v3 span.emoji { filter: hue-rotate(180deg); }
    .v4 span.emoji { filter: hue-rotate(240deg); }
    .v5 span.emoji { filter: hue-rotate(300deg) brightness(1.2); }
    .v6 span.emoji { filter: hue-rotate(45deg) saturate(2); }

    .stepper {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 10px;
    }

    .ctrl-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 4px 10px;
      font-size: 12px;
      color: #475569;
      cursor: pointer;
    }

    .ctrl-btn:hover {
      background: #f1f5f9;
    }
  </style>
</head>
<body>

  <div class="nav-bar">
    <button class="nav-btn active" onclick="setStage(0)">
      <span class="icon">🌍</span>
      Ecosystem
    </button>
    <button class="nav-btn" onclick="setStage(1)">
      <span class="icon">🐠</span>
      Species
    </button>
    <button class="nav-btn" onclick="setStage(2)">
      <span class="icon">🧬</span>
      Genetic
    </button>
  </div>

  <div class="stage-container">
    
    <div class="view-panel eco-grid active" id="view-0">
      <div class="eco-card"><span class="emoji">🪸</span>Reef</div>
      <div class="eco-card"><span class="emoji">🌾</span>Marsh</div>
      <div class="eco-card"><span class="emoji">🪵</span>Mangrove</div>
      <div class="eco-card"><span class="emoji">🏖️</span>Beach</div>
    </div>

    
    <div class="view-panel species-grid" id="view-1">
      <div class="species-card"><span class="emoji">🐠</span>Fish</div>
      <div class="species-card"><span class="emoji">🐢</span>Turtle</div>
      <div class="species-card"><span class="emoji">🦀</span>Crab</div>
      <div class="species-card"><span class="emoji">🐙</span>Octopus</div>
      <div class="species-card"><span class="emoji">🪼</span>Jellyfish</div>
      <div class="species-card"><span class="emoji">⭐</span>Starfish</div>
    </div>

    
    <div class="view-panel genetic-grid" id="view-2">
      <div class="gene-card v1"><span class="emoji">🦀</span><span class="dna-tag">AA</span></div>
      <div class="gene-card v2"><span class="emoji">🦀</span><span class="dna-tag">Aa</span></div>
      <div class="gene-card v3"><span class="emoji">🦀</span><span class="dna-tag">aa</span></div>
      <div class="gene-card v4"><span class="emoji">🦀</span><span class="dna-tag">A'A</span></div>
      <div class="gene-card v5"><span class="emoji">🦀</span><span class="dna-tag">a'a</span></div>
      <div class="gene-card v6"><span class="emoji">🦀</span><span class="dna-tag">A'a</span></div>
    </div>
  </div>

  <div class="stepper">
    <button class="ctrl-btn" onclick="prevStage()">◀ Prev</button>
    <button class="ctrl-btn" onclick="nextStage()">Next ▶</button>
  </div>

  <script>
    let current = 0;
    const views = [
      document.getElementById('view-0'),
      document.getElementById('view-1'),
      document.getElementById('view-2')
    ];
    const btns = document.querySelectorAll('.nav-btn');

    function setStage(idx) {
      current = idx;
      views.forEach((v, i) => v.classList.toggle('active', i === idx));
      btns.forEach((b, i) => b.classList.toggle('active', i === idx));
    }

    function nextStage() {
      setStage((current + 1) % 3);
    }

    function prevStage() {
      setStage((current - 1 + 3) % 3);
    }
  </script>
</body>
</html>

## Worked Example: Classifying Biodiversity Levels

Consider a conservation reserve: biologists record 45 bird species, note that cheetahs have nearly identical DNA due to a historic bottleneck, and document four distinct biomes (savanna, wetland, forest, and rocky outcrop).

Here, the 45 bird species represent **species richness**, the cheetahs' low variation represents poor **genetic diversity**, and the four biomes represent high **ecosystem diversity**.

A common mistake is assuming that an area with many animals automatically has high overall biodiversity. If all 500 animals in a valley belong to just two species with nearly identical DNA, species evenness and genetic diversity remain critically low.

science

Types of Biodiversity: Genetic, Species, and Ecosystem. Distinguish between genetic diversity, species diversity, and ecosystem diversity as components of total biodiversity.

GCSE Biology: Biodiversity and Human Management of Ecosystems

Biodiversity: Genetic, Species, and Ecosystem Diversity

Encyclopedic Entry: Biodiversity (Levels and Ecological Roles)

Teaching this topic effectively requires moving from macro-scale observations down to the molecular level before connecting them back together. Begin with a local ecosystem sorting activity (e.g., contrasting a monoculture lawn with a rewilded meadow) to ground the concepts of species richness versus evenness. Next, utilize the Cavendish banana or Irish Potato Famine case study to make the abstract concept of genetic diversity concrete and consequential. Emphasize the nested relationship so students understand that ecosystem stability is built on species interactions, which in turn rely on intraspecific genetic variation.

Types of Biodiversity: Genetic, Species, and Ecosystem

1. Genetic Diversity

2. Species Diversity