23. Speciation
Species
Multiple Choice
Multiple ChoiceSometimes two phenotypically different populations interbreed to a limited extent, so that it is difficult to determine whether they are clearly separate species. This is not a concern to scientists because this __________.
A
is quite rare
B
is true for almost every species
C
supports the theory of punctuated equilibrium
D
happens only among plants, not among animals
E
may indicate that the formation of a new species is in progress
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