PLEASE HELP NOW ASAP Mutagenic agents are substances that

1) have no effect upon the rate of gene mutations

2) cause gene mutations but not other chromosomal changes

3) decrease the rate of gene mutations

4) increase the rate of gene mutations

The answer would be 4

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.