The effectiveness of geographic barriers in promoting speciation is related most to ____.
A) the absolute size of the barrier
B) the inability of the organisms to overcome the barrier
C) the speed at which the barrier forms
D) how long the barrier exists
E) the size of the population it separates

Question

The effectiveness of geographic barriers in promoting speciation is related most to ____.  
A) the absolute size of the barrier
B) the inability of the organisms to overcome the barrier
C) the speed at which the barrier forms
D) how long the barrier exists
E) the size of the population it separates

Quizplus · Accepted Answer

The inability of the organisms to overcome the barrier is crucial for speciation because it prevents gene flow between populations, allowing them to evolve independently.

The Effectiveness of Geographic Barriers in Promoting Speciation Is Related