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ENVIRONMENTAL STUDIES BIOSPHERE Combined portions of Earth in which all living things exist INDIVIDUAL ORGANISMS POPULATIONS COMMUNITIES ECOSYSTEMS BIOMES FOOD CHAINS FOOD WEBS TROPHIC LEVELS BIOMASS PYRAMID NITROGEN CYCLE HABITAT VS. NICHE BIOTIC VS. ABIOTIC FACTORS COMPETITIVE EXCLUSION PRINCIPLE SPECIES INTERACTIONS ***Predation ***Symbiosis ***Mutualism ***Commensalism ***Parasitism PREDATION MUTUALISM HUMMINGBIRD/FLOWER SYMBIOSIS COMMENSALISM SEA ANEMONE /CRAB PARASITISM WASP LARVAE/HORNWORM PRIMARY SUCCESSION SECONDARY SUCCESSION OCEAN PHOTIC AND APHOTIC ZONES ***BENTHOS*** POPULATION DENSITY ***CARRYING CAPACITY*** LIMITING FACTORS AFFECTING POPULATION DENSITY INDEPENDENT DENSITY DEPENDENT DROUGHT CLIMATE EXTREMES HUMAN IDSTURBANCE COMPETITION PARASITISM DISEASE RENEWABLE VS. NON-RENEWABLE RESOURCES SUSTAINABLE USE: Use of natural resources at a rate which does not deplete them BIODIVERSITY The sum total of the variety of organisms in the biosphere HABITAT FRAGMENTATION Splitting of ecosystems INVASIVE SPECIES BIOLOGICAL MAGNIFICATION OZONE LAYER