Two populations of flowers are separated by a mountain range and would not be capable of interbreeding.
This is an example of

A. behavioral isolation

B. physiological isolation

C. temporal isolation

D. geographical isolation

then that particular organisms become extinct.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

b is the correct answer