Please answer all of the questions.

1		The niche of an organism is the place it lives within a community.
			A)	True
			B)	False
2		Heterotrophs are also called consumers.
			A)	True
			B)	False
3		Energy cycles through an ecosystem, while chemicals (nutrients) flow through an ecosystem.
			A)	True
			B)	False
4		Feces, urine, and even the death of an organism means substances are lost to the ecosystem.
			A)	True
			B)	False
5		A food chain shows a single path of energy flow.
			A)	True
			B)	False
6		A grazing food web and a detrital food web can not interconnect.
			A)	True
			B)	False
7		The flow of energy with large losses between trophic levels can be depicted as an ecological pyramid.
			A)	True
			B)	False
8		A biogeochemical cycle involves both living and nonliving components.
			A)	True
			B)	False
9		In a sedimentary biogeochemical cycle, the element in question is withdrawn from the atmosphere and then returned to the soil.
			A)	True
			B)	False
10		Another name for the water cycle is the hydrologic cycle.
			A)	True
			B)	False
11		Cultural eutrophication is the leeching of minerals from the soil by acidic rain.
			A)	True
			B)	False
12		Excess phosphate in fresh water leads to an algal bloom, increased decomposers, and increased fish population.
			A)	True
			B)	False
13		Oxygen makes up about 78% of the atmosphere.
			A)	True
			B)	False
14		Denitrification occurs when anaerobic bacteria convert nitrate back into nitrogen gas.
			A)	True
			B)	False
15		Human activities have no significant effect on the nitrogen cycle.
			A)	True
			B)	False
16		The exchange pool for the carbon dioxide cycle is land plants.
			A)	True
			B)	False
17		In aquatic systems carbon dioxide is in the form of dissolved carbon dioxide.
			A)	True
			B)	False
18		A desert has a lack of moisture and is very dry.
			A)	True
			B)	False
19		Altitude and rainfall greatly influence the type of vegetation in a particular biome.
			A)	True
			B)	False
20		Human activities have impacted many of the Earth's ecosystems in both good and adverse ways.
			A)	True
			B)	False