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Which of the following statements about speciation is false? A. Evolution always results in speciation. B. Gene flow within a population must be interrupted for speciation to occur. C. Allopatric speciation is synonymous with geographic speciation. D. Founder effects are important in speciation. E. Gene flow within a population may be interrupted in the absence of physical separation.

A. Evolution always results in speciation.

Ginkgo trees (Ginkgo biloba) are "living fossils." Although ginkgos are native to China, they are now commonly planted in cities in the United States. Keeping in mind the principles of allopatric speciation, what might happen over time to the two populations of ginkgos? A. Nothing, because ginkgo trees have evolved so slowly. B. Environmental factors, such as air pollution, could result in the more rapid evolution of the trees in the cities of the United States. C. Reproductive isolation could develop. D. The two populations could develop into separate species. E. All of the above

E. All of the above

Two species of garter snakes in the genus Thamnophis occur in the same geographic areas, but one mainly lives in water while the other is terrestrial. Which type of prezygotic barrier exists to these species' reproduction? a) temporal isolation b) gametic isolation c) behavioral isolation d) habitat isolation e) mechanical isolation

d) habitat isolation