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Biosphere

the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist

Community

(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other

Autotroph

plant capable of synthesizing its own food from simple organic substances

Chemosynthesis

synthesis of carbohydrate from carbon dioxide and water

Detritivore

organism that feeds on plant and animal remains and other dead matter

Biomass

the total mass of living matter in a given unit area

Tanspiration

When a plant releases water into the atmosphere

Denitrification

conversion of nitrates into nitrogen gas

Biome

a major biotic community characterized by the dominant forms of plant life and the prevailing climate

Trophic Level

each step in a food chain or food web

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