Once during mitosis and twice during meiosis.
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<span>a)Stem cells must always be provided by a donor who is financially compensated.</span>
Answer:
Enzymes speed up the chemical reactions in living cells.
Explanation:
An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over.
