Water in the oceans tends to move in great currents from the:
a. north pole to the south pole
b. equator to the poles
c. poles to the equator
d. south pole to the north pole
e. equator to the poles and back again
e
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The incubation period of gonorrhea is approximately
A. 2-5 days. B. 1-2 weeks. C. 14-21 days. D. several months.
Which of the following is a unique feature of viruses that separates them from bacteria?
A. They are generally smaller. B. They are often highly toxic. C. They lack proteins. D. They have different nucleotides in their hereditary material. E. They cannot exist outside of a host cell.
This is best described as how an animal responds to stimuli in its environment:a
behavior. b. learning. c. proximate causes. d. ultimate causes. e. direct fitness..
At the time life arose on Earth, Earth's atmosphere contained all but which of the following?
a. H2 b. N2 c. O2 d. H2S