Organism definition - Individual, biotic factor, Ecosystem definition - where living organisms (biotic) interact with each other and with their physical environment (abiotic)., Population definition - a group of individuals of the same species living in a specific place, Community definition - includes populations of organisms (biotic only) of different species., organism example - one deer, population example - three deer, community example - deer and fox in grass, ecosystem example - deer, trees, snow, sunlight, air,

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