Sexual reproduction increases genetic diversity.
Mammals are dioecious with sexual reproduction and internal fertilization.
Something that mammals do increases genetic diversity.
What increases genetic diversity?

  * By coral exoskeletons
  * Something that waters do
  * Something that planets do
  * fertilization
  * Something that rocks do
  * deoxyribonucleic acid
  * Males and females
  * Somethign that mammals do.