Many times species are composed of networks of distinct populations called metapopulations. Metapopulations occur in areas where
A. a population in better habitats continually sends out dispersers to bolster populations in poorer habitats.
B. a population in poor habitat continually sends out dispersers to bolster populations in better habitats.
C. a population in better habitats does not send out colonizers into poorer habitats.
D. suitable habitat is patchily distributed and separated by areas of unsuitable habitat.
Answer: D