Most extinction is ________
A) gradual, generally occurring when species cannot adapt genetically to changes in environmental conditions
B) not often a problem for endemics
C) the result of environmental catastrophe
D) problematic for generalists
E) the result of slow climate change
A
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Which is the reason for the land subsidence in the San Joaquin Valley in California?
A. agriculture B. earthquakes C. compaction by heavy machinery D. power generation
Explain the difference between the physical distance and the cost distance in distance measure operations.
What will be an ideal response?
The difference between impulse and impact force involves the
A) distance the force acts. B) time the force acts. C) difference between acceleration and velocity. D) mass and its effect on resisting a change in momentum.
A diagram of the flow of energy through an ecosystem resembles a pyramid. This explains why
A) some ecosystems have a higher primary productivity than others. B) animals need energy for maintenance. C) there is more grass than zebras, and more zebras than lions, on the African savanna. D) not every organism at one level of the food chain is eaten by an organism at the next level of the food chain.