Cancer ranks as the number __ cause of mortality in the U.S.
a. 1
b. 2
c. 3
d. 4
Answer: b. 2
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All types of internal fertilization require
A. specialized anatomical structures. B. physical joining of male and female. C. transfer of a spermatophore to the female reproductive tract. D. a terrestrial environment. E. both a terrestrial environment and accessory sex organs.
Alcohol acts predominantly as a(n)
a. stimulant. b. analgesic. c. hallucinogen. d. depressant. e. anesthetic.
XH2 + NAD+ ? X + NADH + H+. In the preceding equation, NAD+ is said to be:
a. an enzyme. b. storing two hydrogen atoms. c. reduced. d. oxidized. e. a catalyst.
In Yellowstone National Park, wolves were hunted to extinction in the 1920s. A current restoration project has reintroduced wolves to Yellowstone National Park
Predict the response of the Yellowstone ecological community if wolves are a keystone species. A) Species richness should decrease. B) The relative abundances of each species should become more unequal. C) Species diversity should decrease. D) Species richness should increase, and the relative abundances of each species should be about equal.