A diploid germ cell reduces its chromosome number by half to generate four haploid cells in
A. replication.
B. parthenogenesis.
C. meiosis.
D. fertilization.
E. mitosis.
C. meiosis.
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The primary function of a phagocyte is to
A) destroy pathogens. B) engulf pathogens. C) evade pathogens. D) both engulf and destroy pathogens.
Capillary walls consist only of
A. a single layer of epithelial cells covered by connective tissue. B. connective tissue. C. a single layer of endothelial cells. D. smooth muscle. E. a single layer of epithelial cells covered by smooth muscle.
Iron is required for primary production. Which of the following is correct to predict?
a. Iron fertilization of oceans can raise N2 in the atmosphere. b. Iron fertilization of oceans can lower O2 in the atmosphere. c. Iron fertilization of oceans can raise CO2 in the atmosphere. d. Iron fertilization of oceans can lower CO2 in the atmosphere.
Factors that contribute to the spread of poliovirus include
> Its ability to survive the harsh conditions of the gastrointestinal tract > An ability to produce endospores > The lack of an effective vaccine > An ability to spread via fomites contaminated with feces