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Orgnaism that grows, feeds and is shelterd in or on a different organism while contributing nothing to the survival of its host
All organism that are the smae number of energy transfers away from the original source of energy (Sunlight) that enters an ecosystem
The amound of usable energy entering one trophic level transferred to the organism at the next trophic level
Biogeochemical cycle that collects, purifies and distributes the earth's supply of water from teh envrionment to living organism then back to the environment
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