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The large ground finch obtains food by cracking seeds. what is its short, strong beak an example? a) tendency toward perfection b) adaptation of a species over time c) selective use and disuse of an organ over time d) scarcity of recourses
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What is thought to have caused the mass extinction at the end of the cretaceous period?
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Which of the following typically characterizes a tropical rainforests
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The only difference in the chemical structure of DNA between various organisms is---
the number of...
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