Review the image(s) and answer the following questions.

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1		Where is the major reservoir for the water cycle?
			A)	glacial ice
			B)	atmospheric water vapor
			C)	oceans
			D)	bodies of freshwater
2		What two factors regulate rainfall?
			A)	transpiration and evaporation
			B)	evaporation and condensation
			C)	transpiration and condensation
			D)	The location determines which of these pairs of factors is most important.

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3		Where is the major reservoir for the earth's carbon cycle?
			A)	plant biomass
			B)	bicarbonates in water
			C)	carbonates in sediment
			D)	atmospheric carbon dioxide
4		What is the carbon cycle most closely linked to within communities of organisms?
			A)	the food chain
			B)	the hydrologic cycle
			C)	the sulfur cycle
			D)	the nitrogen cycle

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5		What group of organisms plays a critical role in delivering nitrogen to plants?
			A)	ammonifying bacteria
			B)	nitrogen-fixing bacteria
			C)	birds
			D)	defecating herbivores and carnivores
6		What group of organisms plays a global role in returning nitrogen to the atmosphere?
			A)	nitrogen-fixing bacteria
			B)	ammonifying bacteria
			C)	nitrifying bacteria
			D)	denitrifying bacteria

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7		Why are birds shown at the top of this food chain as being susceptible to high concentrations of DDT?
			A)	Birds are at the top of every aquatic food chain.
			B)	Birds consume fish at all levels of aquatic food chains.
			C)	DDT made the eggshells of predatory birds very fragile, and their population sizes plummeted, leading to a ban of DDT in the United States.
			D)	There is no significance to showing birds at the top of this food chain.
8		Why does DDT magnify within food chains when certain other chemicals do not?
			A)	DDT is more toxic.
			B)	DDT is stored in animal fat and is not readily eliminated from the body.
			C)	DDT is now present in great quantities in most natural habitats.
			D)	All of these are correct.