"At one time there was a shallow pond in this area. Now it has all filled in and is a field." This statement would best describe
A. climax community.
B. primary succession.
C. secondary succession.
D. pioneer community.
B. primary succession.
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Division of the cytoplasm in animal cells
a. begins with the formation of microtubules at each pole of the nucleus. b. begins with Golgi body vesicles guided by microtubules to the center of the cell. c. begins in the S phase of interphase. d. begins with the deposition of a very rigid lipid bilayer, which is the major constituent of the cell wall. e. is visible as a cleavage furrow created by microfilaments in the cell's midsection
A population of 1,000 individuals with a per
capita growth rate of 1.0 per year in an environment with unlimited resources will number ____ four years later.
a. 1,000 b. 1,400 c. 4,000 d. 16,000 e. 160,000
In cardiovascular disease, "MI" refers to
A. high blood cholesterol. B. a heart attack. C. a stroke. D. narrowed arteries.
What secretes melatonin, a hormone that promotes sleep, in human beings?
a. pineal gland b. suprachiasmatic nucleus c. crepuscular gland d. biological clock e. hypothalamus