What is a mutagen?
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A. A type of mutation involving chromosomes
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B. A mutation that is inherited from parents
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C. An environmental agent that changes DNA
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D. A way to test for chromosomal mutations
SUBM

it's answer C

Explanation:

In genetics, a mutagen is a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level.

answer; i do believe that the correct answer is; ///mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis;

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher