In which animal is a countercurrent flow system used to acquire oxygen?
A. fish
B. whales
C. mammals
D. lizards
E. birds
Answer: A
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In some organisms, the primary function of a gene in a cell is to participate in regulating the body as a whole rather than responding to the cell's immediate environment. These organisms would be
A. diploid. B. multicellular. C. prokaryotic. D. bacterial.
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The use of chemical agents to harm or kill microbes is
A. immunology. B. chemotherapy. C. epidemiology. D. serology. E. biotechnology.