The area of the world with the most rapidly growing population is
A. South and Central America.
B. Africa.
C. Asia.
D. Europe.
Answer: B
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Which of the following is NOT mined in Australia?
A) gold B) diamonds C) bauxite D) lead E) copper
The approximate altitude of auroral displays is:
A) above 500 km. B) above 1000 km. C) 80-400 km. D) below 30 km. E) about 50 km.
How did the entrenched meanders shown in this figure form?
A) Rising seas flooded a meandering river valley.
B) The land subsided and the river deposited sediment.
C) A meandering river carved into the land due to uplift or falling base level.
D) None of these are correct.
A difference between the innate immune system and the acquired immune system is
A) the innate immune system includes many more different types of receptors than the acquired immune system. B) the innate immune response is immediate, whereas the acquired immune response is delayed, peaking about 3 to 5 days after exposure. C) the innate immune system retains a memory for past exposure, with subsequent responses being faster and more aggressive; the acquired immune system does not. D) each acquired immune system cell responds to a greater number of different pathogens than each innate immune system cell.