Crossing over is important because it ??? genetic diversity.

Crossing over is important because it increases genetic diversity.

Explanation:

Crossing over is a process during meiosis that increases the genetic diversity in the offsprings. During this process, a pair of chromosomes interact with each other to swap genes. As a result, the sister chromatids are no longer identical, which causes offsprings to be different from their progenitors. Also, they give diversity to the species since the chromosomes are different.

meiosis is required for sexual reproduction

sex cells are usually half's then they find another half and make a fertilize egg