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...National life on earth summary notes ecosystems biodiversity is the variety of different organisms in an ecosystem habitat and community together a place where organism lives all present non living biological unit population group same species that can breed to produce fertile offspring example forest tree squirrels deer fox young picture reproduce distribution pitfall trap samples soil hole dug cup put must be level with so fall cover top birds don t see trapped eat them several traps are set increase reliability checked regularly animals have time each other quadrat abundance amount plants thrown at random number squares plant it counted quadrats increases rule for deciding which count as ensure consistency get representative result keys used identify branching key paired statement biotic factors affect things predation predators prey disease food availability grazing levels need not too high or low competition two types o interspecific between members similar resources eg owl intras...