Answer:
Step-by-step explanation:
Mutagen:
It's any agent that can cause changes to the a cell genetic makeup by altering the deoxyribonucleic acid (DNA)
It can be a Physical mutagens (e.g X-rays), chemical mutagens e.g Nitrous acid or biological mutagens as in transposons
Examples of mutagens that cause genetic changes that can be "corrected" by re-exposing cells to the same mutagen are the ones that caused base substitutions (e.g nitrous acid) and Frameshift mutations (e.g proflavin)
A mutagen that do not cause genetic changes like deletion that can be "corrected" Such as by re-exposing cells to the same mutagen is the X rays.