Population - a group of organism of the same species., Ecosystem - Is a community of living organisms interacting with each other and their non-living environment., Producers - Green plants. Only living things that can make their own food., Consumers - Organisms that cannot make their own food but eat plants or other animals., Primary Consumer - First-order consumer, Secondary Consumerr - Second-order consumer, Tertiary Consumer - Third-order consumer, Quarternary Consumer - Fourth-order consumer, Detritivores (millipedes) - Feed on nonliving organic matter , Scavengers (vultures) - Large detritivores, Decomposers (fungi and bacteria) - Breakdown nonliving matter into nutrients that plants need., Food Pyramid - Shows the decreasing amount of energy passed on from one organism to another., Symbiosis (living together) - a close interaction formed between two different organisms living closely together, Predation - The process where an animal called a predatorhunts , captures, kills and eats another animal called prey, Parasitism - One organism, the parasite, depends on another , the host , for food while harming the host in the process, Mutualism - Both organisms benefit. Give and take relationship, Commensialism - One is benefited (commensal ), the giver ( host ) is not affected or harmed, Competition - Organisms compete for the same limited resources., Herbivory - An interaction in which an animal feeds on plants,

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