Of Earth's total number of species, why are the fewest in the marine pelagic realm?
a) There is more area on land for different species.
b) Uniform conditions in the pelagic realm make fewer specialized environments for organism adaptation, evolution and radiation into different species.
c) Organisms need a hard substrate (either land or sea bottom) in order to evolve into different species.
d) Evolution of differing species is triggered by extinction, but extinction is rare in the pelagic environment.
e) The pelagic realm contains the photic zone, and solar radiation in the photic zone suppresses the number of new species that evolve.
B
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