Imagine You Are Looking Down on the Top of a Mountain

question 81

Multiple Choice

Imagine you are looking down on the top of a mountain. As you hike from the highest elevation to the lowest elevation, you find three different species of related mice. None of them is found at the same elevation, and the vegetation changes at each elevation level. At the highest elevation some of the individuals of species A mate with individuals in species B that make their way up from the middle elevation. Their offspring are unable to survive or reproduce in either elevation, and never reproduce. This is an example of:

• A)hybrid inviablity and infertility.
• B)pre-zygotic isolation.
• C)post-zygotic isolation.
• D)instantaneous speciation.

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