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A population of horses is split into two...

A population of horses is split into two population by a new river bed that forms after a flood. After many generations,the river changes course and the population mix again. Which of the following indicates that the two population have formed two separate species?

A

The population refuse to cross the dry river bed to interbreed

B

The population do not interbreed freely in nature

C

One population has twice as many horses with white spots as others

D

The horses interbreed,but the offsprings are shorter either of the parents

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AAKASH INSTITUTE-TEST 6-EXAMPLE
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