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:

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.