In the time interval of Archean, what appeared for the first time?
a. The first continent crust
b. The first rock
c. The first life
d. The first reptile
e. All of the above except d
Answer: e. All of the above except d
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Which of the following is an example of an epidemiological study?
A. The cancer rate of people living downwind to a nuclear power plant was compared with those living upwind. B. Rats were given high concentrations of arsenic for six months and the control group was given a placebo. C. A study of drug overdoses in Los Angeles revealed that cocaine cut with animal deworming compound is dangerous. D. A man in Phoenix ate a banana and died riding his bicycle on a crowded street in the middle of the summer.
Compared with falling on a wooden floor, a wine glass may not break when it falls to a carpeted floor because of the
A) lesser impulse in stopping. B) longer time to stop. C) both A and B D) neither A nor B
An ecological niche is essentially the same thing as a habitat
Indicate whether the statement is true or false
Beaches:
a. are always made of coral reef fragments. b. always have lagoons. c. can be made out of cobble-sized sediment. d. are not attached to the mainland. e. are attached to the mainland only at one end point.