A. The mitochondria because it is the power house of the cell.
They contain different cell receptors and communication pathways
This varieation can be justified because since they had different variations they probably had different niches which led them to evolve differently,this will help because the two species will have no competition
Crossing over. Parts of sister chromatids will sometimes switch places with the parallel part, resulting in a completely unique DNA sequence.
Independent assortment occurs spontaneously when alleles of at least two genes are assorted independently into gametes.
