Answer:
B
Mutation is the ultimate source of genetic variation, but mechanisms such as sexual reproduction and genetic drift contribute to it as well Because prokaryotes are haploid, such a mutation immediately become part of the genetic makeup of the cell unlike eukaryotic diploids where a normal second copy of the gene usually protects the cell from the potentially lethal effect of such a mutation.
Http://www.pbs.org/wgbh/nova/cancer/folkman.html
I believe this website will help :)
Explanation:
here your answer
pls follow and make me as brainlist