What effect do keystone species have on an ecosystem?
A. They destroy habitats.
B. They maintain biodiversity.
C. They cause primary disturbances.
O
D. They make weak species extinct.

B. They maintain biodiversity.

Hope this helps ;)

answer: all : )

explanation:

answer; the male's sperm cells have mitochondria, but because the sperm contributes dna but no cytoplasm, no mitochondria are passed to the egg at ferilization;