Mutations

a) cannot be caused by the environment
b) are the main sources of microevolution
c) can be discovered through genetic testing
d) are always harmful to an organism

Mutations .

A) cannot be caused by the environment

B) are the main sources of microevolution

C) can be discovered through genetic testing

D) are always harmful to an organism

Explanation:

Gene or molecular mutations:

They are the mutations that alter the nucleotide sequence of DNA.

The answer is: C) can be discovered through genetic testing.

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the answer would be d