A) sympatric
B) allopatric
C) sibling
D) keystone
Correct Answer: A
Solution :
The species living in a restricted or overlapping area of geographical distribution, are called sympatric species. The species which have exclusive area of geographical distribution, are called allopatric species. True species which do not interbreed but are otherwise difficult to separate on the basis of morphological characters only, are called sibling species. The species that play central role in ecology of a place is called keystone species.
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