The effectiveness of geographic barriers in promoting speciation is related most to ____

a. the absolute size of the barrier
b. the inability of the organisms to overcome the barrier
c. the speed at which the barrier forms
d. how long the barrier exists
e. the size of the population it separates


ANSWER: b

Biology & Microbiology

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a. Bacteriophages b. Chloroplasts c. Slime molds d. Protists e. Nuclei

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nuclei are equal, the egg contributes more to cell differentiation because of a. its energy reserves. b. its cytoskeletal elements. c. its specialized proteins. d. its maternal messages. e. all of these.

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