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Unit 5

TermDefinition
extinct species species that no longer exists.
biodiversity variety of living organisms on Earth.
symbiosis relationship in which organisms live closely together over a long period of time.
parasitism relationship in which one species, the parasite, feeds on a second organism, the host.
mutualism symbiotic relationship in which both species benefit.
commensalism relationship in which one organism benefits while the other organism is not affected.
natural selection process that makes it more likely that organisms with the best characteristics for survival in a specific environment survive, reproduce, and pass on their advantageous genetic traits.
endangered species species that has so few individuals remaining that extinction is a possibility in the near future.
threatened species species whose numbers are dwindling to a point at which the species could become endangered.
adaptation special, inherited characteristic that helps an organism better survive in its environment and which is developed over time.
structural adaptation physical characteristic that helps an organism survive in its environment longer.
behavioral adaptation way in which an organism acts or responds to its environment in order to survive.
mimicry adaption in which one species copies the appearance or behavior of another species.
reflex behavior that is triggered automatically by something outside an organism itself.
instinct behavior that an organism carries out because it is genetically prone to do so.
Created by: Lekaiah
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