Occurrence of endemic species in South America and Australia is due to `:`

Options

A. these species have been extinct from other regions
B. continental separation
C. there is no terrestrial route to these places
D. retrogressive evolution

Answer

B

Explanation

Seas separating the continents form barriers to free intercontinental movement causing evolution of organisms independently in these continents leading to endemism. Endemic species are those species which are found in a restricted area of the world.