Biology

What is the upper surface of the plant leaf called?

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Animals which eat both plants and other animals are known as what?
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What is a main reason that many species are becoming endangered?
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Which rays of the sun can damage the skin?
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What is the expected time an organism will live called?
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Which theory states that living things come only from other living things?
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How many joints does an ant have in each leg?
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Which pair of animal species and type is correct?
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Which of the following is a virus?
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