Each substance contributes to acid rain EXCEPT
a. the ozone.
b. waste products from the burning of coal.
c. nitrogen fertilizers.
d. waste products from the burning of gasoline.
e. motor vehicles.
A
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Microcystis aeruginosa is a species of cyanobacteria. What CANNOT be true of this species?
A. It synthesizes organic molecules. B. It is an obligate anaerobe. C. Its cells contain an extensive thylakoid. D. It uses ammonia to produce proteins. E. It secretes mucilage.
Approximately when did the earth's crust solidify?
A. 8 billion years ago B. 1 billion years ago C. 4 billion years ago D. 4 million years ago
Which statement about bryophytes is NOT
true?
a. The sporophyte is diploid. b. The sporangium produces gametes. c. The sporophyte is dependent upon the gametophyte. d. Mitosis precedes gamete formation. e. Sportophytes are formed by mitosis
Which of the following species is NOT likely to be considered a keystone species?
a. a top predator, such as a wolf, whose diet serve to control the prey population size, which also indirectly affects the abundance and growth of vegetation b. a fish species that specializes in eating only a few aquatic plant species and that does not form a main component of the diet of the carnivores in the system c. an insect whose foraging movements result in the movement of pollen and fertilization of many kinds of plant species d. all of the above are examples that describe keystone species e. none of the above is an example that describes keystone species