The dodo bird is ___. It no longer lives anywhere on Earth.

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"An idea that explains something, but may or may not be right."

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A lot of evidence supports the ___ of continental drift, which explains why the continents look like puzzle pieces that could fit together.

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"removed from existence."

Cacti can ___ in hot, dry climates where many other plants would die.

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disguise, hide, cover

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live

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"The process of evolution by which forms of life that are better adapted to their specific environment survive and reproduce more often than those that are less well adapted."

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The scientist found a (n) ___ in the rock. She studied it to learn more about what animals used to live here.

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"in biology, changes that happen over time in the gene pool of a population."

One example of ___ is how moths that couldn't blend in with their environments as well as others died out over time.