Flash Cards

Lesson 3 Interactions Among Living Things

Term Definition
Natural Selection anything naturally occurring in the environment that humans use
Adaptation an inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment
Niche how an organism makes its living and interacts with the biotic and abiotic factors in its habitat
Comptetion the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time
Predation an interaction in which one organism kills another for food or nutrients
predator the organism that does the killing in a predation interaction
Prey an organism that is killed and eaten by another organism in a predation interaction
Symbiosis any relationship in which two species live closely together and that benefits at least one of the species
Mutualism a type of symbiosis in which both species benefit from living together
Commensalism a type of symbiosis between two species in which one species benefits and the other species is neither helped nor harmed
Parasitism a type of symbiosis in which one organism lives with, on, or in a host and harms it.
Parasite the organism that benefits by living with, on, or in a host in a parasitism interaction
Host an organism that a parasite lives with, in, or on, and provides a source of energy or a suitable environment for the parasite to live

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