Which pair of variables below are not related in a positive feedback loop?
A. snow cover on Earth's surface; global average temperature
B. population of rabbits and bobcats
C. water vapor and air temperature
D. population of hummingbirds and population of flowers
Answer: B
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You are an aquatic biologist studying a small lake. The stream that drains into this lake runs by croplands. You are detecting a pesticide called atrazine in the insects and worms that live in the lake
The predatory birds such as herons and egrets have very high concentrations of atrazine in their blood. The birds prey on the frogs and small fish. What process explains the high atrazine level in the birds? a. antagonistic interaction b. Persistence c. chronic effect d. biological magnification e. none of these answers
A higher proportion of black daisies on Daisy World can impact the hydrologic cycle leading to
A) higher temperatures, more evaporation, and more cloud cover, with the retention of greenhouse water vapor trapping more outgoing longwave radiation. B) higher temperatures, less evaporation, and less cloud cover, with less retention of greenhouse water vapor trapping more outgoing longwave radiation. C) lower temperatures, more evaporation, and more cloud cover, with the retention of greenhouse water vapor trapping more outgoing longwave radiation. D) lower temperatures, less evaporation, and less cloud cover, with less retention of greenhouse water vapor trapping more outgoing longwave radiation.
The major difference in vegetation between the different humid tropical (
A) regions is that ________. A) wet tropical regions have grasslands, and tropical wet and dry regions have brush and succulents B) wet tropical regions have rain forests, and tropical wet and dry regions have grasslands C) wet tropical regions have grasslands, and tropical wet and dry regions have rain forests D) wet tropical regions have brush and succulents, and tropical wet and dry regions have grasslands E) wet tropical regions have rain forests, and tropical wet and dry regions have brush and succulents
A sinkhole that develops over the roof of an underground cavern is known as a
A) drip curtain. B) solution sinkhole. C) collapse sinkhole. D) karst valley. E) karst tower.