Two populations of the same species over time grow distant from one another. At what point will these two populations be considered different species?
Correct answer: D. When they are no longer able to interbreed
- A. When the populations begin to eat different foods
- B. When there is a physical barrier, such as a river
- C. When the two populations have not been in contact with one another for two hundred years
- D. When they are no longer able to interbreed
Explanation
option D is correct as two populations of the same species can be considered different species when they are unable to interbreed and produce fertile offspring. This is called speciation.
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About Evolution
Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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