Keystone predators can maintain species diversity in a community if they a) competitively exclude other predators. b) prey on the community's dominant species. c) allow immigration of other predators.
d) reduce the number of disruptions in the community. e) prey only on the least abundant species in the community.

not sure if this is what you'r looking for prokaryotes have organelles hope this out at least.

i say yes because i mean like they were born at the same time "in genesis in the " no, because who knows what humans have affected first it could be the ocean floor or the continent. mostly the continent older because that's what we live on & we mostly make manmade things on it.how's that?