Biology

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

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What substance is produced by flowers and sometimes causes hay fever?
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Which animal was mistaken for the source of the bubonic plague?
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What vertebrates are cold-blooded and have dry scaly skin?
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In what part of the body is hair growth the fastest?
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How many stages of sleep are there?
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Which of these animals might compete for the same food source as a red-tailed hawk?
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What sort of plant has an internal system of tube-like structures?
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What Japanese delicacy can be deadly if not prepared correctly?
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