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Key Idea 3: Individual organisms and species change over time.

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<p><strong>Key Idea 3:</strong> Individual organisms and species change over time.<br></p>

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To view these resources with no ads, please Login or Subscribe to help support our content development.

School subscriptions can access more than 175 downloadable unit bundles in our store for free (a value of $1,500).

District subscriptions provide huge group discounts for their schools. Email for a quote: sheri@exploringnature.org.

Exploringnature.org has more than 2,000 illustrated animals. Read about them, color them, label them, learn to draw them.