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the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
a system formed by the interaction of a community of organisms with their physical environment
organisms that break down wastes and dead organisms and return raw materials to the environment
diagram that shows the relative amounts of energy or matter within each trophic level in a food chain or food web
process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another
process in which bacteria convert nitrogen gas into nitrogen compounds plants can use to make proteins
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