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Correct Answer: C) Hunter gatherers.
Correct Answer: A) Sick-building syndrome.
Correct Answer: C) Autotrophs.
Correct Answer: A) 159.
Correct Answer: C) Central Pollution Control Board.
Correct Answer: A) Seismic wave.
Correct Answer: C) Industrial revolution.
Correct Answer: B) Supply and demand.
Correct Answer: D) It reflects light from the Moon.
Correct Answer: B) Are less economically developed and have a less average income.
Correct Answer: D) Temperature and precipitation.
Correct Answer: B) Tilted farther away from the Sun.
Correct Answer: C) Risk.
Correct Answer: A) Gaining.
Correct Answer: B) Pumping heated water or steam from rock formations.
Correct Answer: D) Experimental Group.
Correct Answer: A) 172.
Correct Answer: D) Pesticides.
Correct Answer: A) How much greenhouse gas is produced.
Correct Answer: A) Plant.
Correct Answer: A) Free nitrogen.
Correct Answer: D) Europe.
Correct Answer: B) Lichen.
Correct Answer: B) Trees.
Correct Answer: B) At plate boundaries.