Nitrogen fixation is a process that _____
A) recycles nitrogen compounds from dead and decaying materials
B) converts ammonia to ammonium
C) releases nitrate from the rock substrate
D) converts nitrogen gas into ammonia
D
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The diversity of our native grassland species is in decline. Restoration ecologists working to restore native grasslands are experimenting with combinations of burning and grazing to simulate natural conditions and increase species diversity
According to Joseph Connell, what level of burning and grazing should ecologists aim for? A. Strong enough to limit interspecific competition, but not strong enough to limit the number of species that can tolerate the environment. B. Strong enough to promote interspecific competition and niche diversification, but not strong enough to promote competitive exclusion. C. Strong enough to promote indirect competition, but not strong enough to promote direct competition. D. Strong enough to selectively favor one or more keystone species, but not strong enough to favor their competitors. E. None of these.
Which of the following is a physical barrier in the nonspecific defense of a mammalian host?
A. Phagocytosis B. Mucous membranes C. Fever D. Inflammation
Human skin color is an example of ____, while sickle-cell anemia is an example of ____
a. multiple alleles; epistasis b. incomplete dominance; multiple alleles c. polygenic inheritance; pleiotropy d. pleiotropy; polygenic inheritance e. incomplete dominance; pleiotropy
Which of the following does not necessitate surgical delivery?
A. Dislodged placenta B. Kinked umbilical cord C. Maternal age above 30 D. A sexually transmitted disease in the mother E. A placenta that covers the cervix