Which of the following elements is an alkali metal?
A. cerium (Cr)
B. argon (Ar)
C. lead (Pb)
D. lithium (Li)
E. indium (In)
Answer: D
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A likely scenario for causing the population trend shown in the diagram below is
A) the carrying capacity changed.
B) favorable environmental conditions caused a temporary population explosion above the carrying capacity.
C) a keystone predator was removed from the ecosystem at the point that the population began to decline.
D) primary succession began at the time when the population reached its peak.
Upper-level winds in the middle latitudes of both hemispheres generally blow from ____
a. the north b. the east c. the south d. the west e. changing directions
Which ocean has the greatest average depth?
A) Indian B) Pacific C) Arctic D) Atlantic
Both channelization and levees can
A. increase flood problems upstream. B. decrease flood problems downstream. C. effectively eliminate floods in the valley. D. increase flood problems downstream.