Biology

What is the upper surface of the plant leaf called?

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What can an animal that eats berries and fish be called?
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What characteristic could show that a bird might be ready to reproduce?
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Which famous scientist introduced the idea of natural selection?
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What is group of cells that work together and form an organ called?
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Which of these animals is cold-blooded?
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What is the average natural lifespan of an African elephant?
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What is the largest member of the weasel family in the United States?
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What part of the blood helps clotting?
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