Biology

What do we call things that directly affect all activities of cells?

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What do you count on a tree to tell how old it is?
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Which of these brain structures is part of the limbic system?
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Where does the zygote of a gymnosperm develop?
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What sea creature was likely the cause of the mermaid legend?
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Which characteristic means moving from place to place?
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Which of following words means "to die"?
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What is the liquid in your mouth that helps soften food called?
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Where would you find dragonfly eggs?
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