All of the following are major categories of microbial control methods except
A. genetic methods.
B. mechanical removal methods.
C. physical agents.
D. chemical agents.
Answer: A
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The continuous, low-level extinction rate of species is sometimes called:a
mass extinction. b. minimal extinction. c. selective extinction. d. temporal extinction. e. background extinction.
What is the main adaptive advantage of the C4 and CAM photosynthesis strategies over the C3 strategy?
A) They help the plant synthesize glucose efficiently under dry conditions. B) They allow the plant to fix carbon under conditions of low CO2. C) They allow the plant to fix carbon in cool conditions. D) They make it possible for the plant to use the Calvin cycle at night.
Which of the following is/are associated with "predatory aggression"?
a. stimulation of the ventral tegmental area b. high levels of sympathetic activity c. increased vocalizations or threatening postures d. stimulation of the medial hypothalamus e. a and b
Which is the smallest of all levels of organization?
A. organism B. cell C. organ D. atom E. population