How is sympatric speciation similar to allopatric speciation? a. they both are mechanisms by which new species arise. b. they both result in a subspecies evolving into a subpopulation. c. they both involve joining two gene pools that were formerly separated. d. they both involve speciation due to physical barriers. i think the answer is a. but i'm not sure tell me if i am correct or not! they both are mechanisms by which new species arise.