A substance that enters into a chemical reaction is called a(n) . catalyst
enzyme
product
reactant

The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

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Explanation:

yes it is weird but true

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.