Sexual dimorphism has arisen as a result of ____.

A. stabilizing selection
B. heterozygote superiority
C. kin selection
D. sexual selection
E. directional selection


Answer: D

Biology & Microbiology

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A. true B. false

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Who developed the two-part naming system scientists use today to classify newly found organisms?

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d. Alexander von Humboldt e. Ernst Mayer

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How much of O2 from water flowing over gills is extracted by countercurrent exchange?

a. 50 to 60% b. 60 to 70% c. 80 to 90% d. 90 to 100%

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