The majority of kidney complications are due to ________
a. gallstones
b. diabetes
c. constipation
d. dehydration
e. urinary tract infections
b
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Natural selection is a quick and effective way of eliminating harmful alleles from the population
a. True b. False
The hydroperiod of a wetland is longest for
A) riverine wetlands. B) basin wetlands. C) fringe wetlands. D) coastal wetlands.
Which is the largest division of the geologic time scale?
a. eon b. era c. epoch d. period e. millennium
Members of the ancestral salamander species live in northern California. As they migrate southward, populations are separated by the Central Valley. With limited contact between populations on the east and west of the valley, genetic differences accumulate. What type of speciation occurs under these conditions? 
A. sympatric speciation B. allopatric speciation C. Both sympatric and allopatric speciation. D. Neither sympatric or allopatric.