abiotic factor, a nonliving component of an ecosystem, biodiversity, the variety of living things in an ecosystem, biotic factor, a living or once-living component of an ecosystem, commensalism, a symbiotic relationship where one organism benefits and the other is not affected, community, all the different populations of living things that live together in one area, competition, occurs when two or more organisms try to use the same limited resources, ecosystem, the interaction of all the living and nonliving things in an environment, host, an organism that provides food or shelter to a parasite, mutualism, a symbiotic relationship where both organisms benefit, niche, the role a population plays in an ecosystem, organism, a living thing, parasite, an organism that lives on or inside another organism, and benefits at the expense of its host, parasitism, a symbiotic relationship where one organism benefits and the other is harmed, population, all the organisms of the same species living in the same area at the same time, predator, an organism that hunts and eats another organism for food, prey, an organism that is hunted and eaten by a predator, species, organisms that are closely related and can mate to produce fertile offspring, symbiosis, a relationship between two different species where at least one benefit.

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