Acid rains have the same effect as
a. use of manufactured fertilizers
b. ion exchange.
c. denitrification.
d. leaching.
e. weathering.
Answer: a
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Which of the following statements is NOT TRUE
concerning an electron that has absorbed a photon? a. It moves to a higher energy level. b. It becomes more stable. c. It quickly returns to its original energy level. d. It may emit energy. e. It becomes excited.
Of the following anatomical structures, which is homologous to the bones in the wing of a bird?
A. bony rays in the tail fin of a flying fish B. chitinous struts in the wing of a butterfly C. bones in the hind limb of a kangaroo D. bones in the flipper of a whale E. cartilage in the dorsal fin of a shark
Conservation biology includes
a. a survey of biological diversity. b. a look at the evolutionary origins of diversity. c. ecological considerations of diversity. d. an effort to maintain biodiversity. e. all of these.
Amoebas move from place to place by means of their
A. pseudomonads. B. plasmodia. C. cysts. D. sporocarps. E. pseudopods.