One idea of biogeography is that the longer an environment is geographically separated from others, the more distinct its species will be. Which area of the earth would you expect to have the

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.