The ability of the human body to maintain a relatively constant internal environment is known as ________
A) homeostasis
B) stabilization
C) positive feedback
D) regulation
A
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There are more helpful types of bacteria on this planet than harmful types.
Indicate whether the statement is true or false.
The persistence of the sickle-cell anemia allele
in the African population is the result of a. a high rate of mutation of the normal allele to the sickle-cell anemia allele. b. the advantage of the heterozygous form over the homozygous forms. c. nonrandom mating. d. a decline in the occurrence of malaria in Africa. e. genetic drift.
Mechanical vectors do NOT transmit infectious agents by____
a. contaminated vehicle b. aerosol formation c. direct contact d. food
Digestion of starches begins in the:a
mouth. b. stomach. c. duodenum. d. jejunum. e. large intestine