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
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"Special pair" is the name given to the ________ in the photochemical complex of the purple bacteria
A) two bacteriochlorophyll a molecules B) two bacteriochlorophyll b molecules C) two quinones D) two reaction centers
Among flowering plants, 30% to 80% of existing species are polyploidy somewhere within their evolutionary history
A. true B. false
Who developed the two-part naming system scientists use today to classify newly found organisms?
a. Charles Darwin b. Carolus Linnaeus c. Aristotle
d. Alexander von Humboldt e. Ernst Mayer
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%