Which is Not a Possible Mechanism for Allopatric Speciation

Question

Which is not a possible mechanism for allopatric speciation?
A) Separation of populations by a river
B) Separation of populations by a mountain range
C) Separation of populations on different islands
D) Separation of populations on co-occurring host plants

Accepted Answer

Allopatric speciation occurs when biological populations of the same species become isolated from each other to an extent that prevents or interferes with genetic interchange. This isolation is typically due to geographical barriers like rivers, mountains, or islands. Separation on co-occurring host plants does not involve geographical isolation, but rather ecological separation, and thus does not fit the definition of allopatric speciation.