Which of these events do scientists think contributes most to the formation of new species?

Question

a. Mate selection
b. Genetic isolation through polyploidy
c. Physical isolation of populations
d. Adaptive isolation due to competition

Answer 1

c. Physical isolation of populations is the most predominant factor.

Best Latest Example:
It is found that the clouded leopards in Borneo which lives in islands are different (almost 56 major genetic differences) from their mainland cousins.
http://environment.newscientist.com/article/dn11384-island-leopard-revealed-as-unique-species.html

Answer 2

Actually the correct answer is B Genetic isolation through polyploidy has the greatest contribution

Answer 3

it is truthfully d. actual isolation is the only particular way of retaining a separate gene pool. Polyploidy does not continually reproductively isolate offspring. And mate decision and adaptive isolation the two contain geographic overlap, and jointly as they are going to reason speciation ultimately, actual isolation is the main drastic and person-friendly form of speciation