Biology

What is the outermost covering of trees and some plants called?

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What substance in your ears helps keep germs and dirt out?
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What substance is produced by flowers and sometimes causes hay fever?
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What is the leaf of a fern called?
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What is any permanent change to a gene called?
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Which is the sheet-like muscle at the bottom of a human chest?
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Why must ferns live in moist environments?
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Which of these animals is closely related to sharks?
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What vertebrates are cold-blooded and have dry scaly skin?
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