Many predator-prey relationships do not result in the complete elimination of the prey because
A) predators cannot catch all of the healthy adults and will shift to other prey if one species is scarce.
B) the predator population is limited by the availability of territorial space.
C) a single species of prey does not provide enough nutrition.
D) the prey populations are always far below carrying capacity.
A
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This figure shows the geologic timescale. Which period listed below would be part of the Paleozoic?
A) Permian
B) Pennsylvanian
C) Mississippian
D) Cambrian
E) All of these are correct.
What is structural adjustment program and what are some of the criticisms against it?
What will be an ideal response?
What do most climate change experts predict will happen to Central Asia?
A) It will be hit hard by climate change, leading to melting of glaciers and reduced river flows. B) Because of the region's low density, the problems will be minimal. C) This dry region will benefit from higher overall precipitation. D) The region will move to the forefront of solar energy technology development. E) This region will not be affected by climate change.
How many amino acids have an amide side chain?
A) 1 B) 2 C) 3 D) 4