abiotic factor - nonliving parts of an organism's habitat (sunlight, soil, temperature, oxygen, water), biotic factor - parts of a habitat that are living or used to be (log, owl, pellet, plant), decomposer - living thing, organism, that breaks down dead organism or their waste. The matter is then recycled back to the food chain., trophic cascade - if something happens to the top predator then all other trophic levels below (omnivores and herbivores) are also impacted. Example: more wolves mean more deer are eaten and then less grass are eaten., 10% rule - as energy travels up the food chain, only 10% of the energy consumed by the previous organism gets moved up the next trophic level.,

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