Enzymes are "reusable" and "specific". what do those two terms mean?

Enzymes are not used up during processes. Thus, they can be reused after they serve their function. They are specific because they only act on specified compounds.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.

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