In the 16th century, a Spanish ship explored a Pacific Island that had a small mountain range separating it. Mice that

were on the ship escaped onto the island on both sides of the mountain range. After decades of separation the two
populations developed different numbers of chromosomes, resulting in reproductive isolation that prevented any future
interbreeding. This speciation event is an example of ____.



a. allopatric speciation
b. sympatric speciation
c. the founder effect
d. inbreeding
e. gene flow


ANSWER: a

Biology & Microbiology

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The nutrient canal is indicated by

a. A. b. B. c. C. d. D. e. E.

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The level of the oceans is rising due to expansion of water volume stemming from ____.

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In which type of microscopy do the specimens appear to be three-dimensional (3-D), allowing their external features to be viewed best?

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