Which mechanism causes postzygotic reproductive isolation?
A. habitat isolation
B. mechanical isolation
C. hybrid sterility
D. temporal isolation
Ans: C. hybrid sterility
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The club fungi are placed in the phylum Basidiomycota
(a) because of their social nature. (b) because they form basidia. (c) because of the presence of an ascocarp. (d) because they are dikaryotic.
If the vas deferens tubes are cut and tied
(vasectomy), the semen eventually will not contain a. fructose. b. buffers. c. prostaglandins. d. sperm. e. any of these.
Cell membranes of living systems are commonly made of a____________________.
Fill in the blank(s) with the appropriate word(s).
Figure 36.6B
Use the figure above to answer the following question.
The structure between "C" and "E" is the ____.
A. right AV valve B. pulmonary vein C. left AV valve D. pulmonary valve E. aortic valve