A chemical change occurs when... A the identity of a substance changes but its appearance does not.

B neither the appearance of a substance nor its identity changes.

C both the physical properties of a substance and its identity change.
D
the appearance of a substance changes but its identity does not.

genetic variation will increase because of a new habitat and food source.

explanation:

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

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