Throughout any introductory examination of ecosystems and environmental sustainability, the importance of human population numbers is cited. Currently, the world and U.S. populations are closest to ________
A) 3 billion; 300 million
B) 9 billion; 400 million
C) 7 billion; 500 million
D) 7 billion; 200 million
E) 7 billion; 300 million
Answer: C
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It is predicted by demographers that how many people will live in the North American Region by the year 2050?
A) 423 million B) 270 million C) 323.9 million D) 41 million E) 464 million
During the inflammatory response,
A. damaged tissues release histamines. B. fluid leaks from capillaries, causing swelling. C. acquired immune cells squeeze out of capillaries and migrate to the site of injury. D. both A and B
An oxygen sag occurs most often
A. After the water recovers from the pollution source B. Immediately downstream from a pollution source C. In estuaries closest to a pollution source D. Immediately upstream from a pollution source E. At any of these places
When the Kelvin wave hits the coast of South America
A. the thermocline is at a much more shallow level as warm water is concentrated at depth. B. the thermocline is at a much more shallow level as cold water is concentrated at depth. C. the thermocline is found much deeper as warm water is concentrated at depth. D. the thermocline is at a much more shallow level as cold water is concentrated at the surface.