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Ch 18

Interactions of Living things

TermDefinition
ecology the study of the interactions between organisms and their environment
biotic describes living factors in the environment
abiotic describes nonliving factors in the environment
population a group of individuals of the same species that live together in the same area at the same time
community all of the populations of different species that live and interact in an area
ecosystem a community of organisms and their nonliving environment
biosphere the part of the Earth where life exists
herbivore a consumer that eats plants
carnivore a consumer that eats animals
omnivore a consumer that eats a variety of organisms
scavenger an animal that feeds on the bodies of dead animals
food chain a diagram that represents the many energy pathways in a real ecosystem
food web a complex diagram representing the many energy pathways in a real ecosystem
energy pyramid a diagram shaped like a triangle shows the loss of energy at each level of the food chain
habitat the environment where an organism lives
niche an organism's way of life and its relationships with its abiotic and biotic environments
carrying capacity the largest population that a given environment can support over a long period of time
prey an organism that is eaten by another organism
predator an organism that eats other organisms
symbiosis a close, long-term association between two or more species
mutualism a symbiotic relationship in which both organisms benefit
commensalism a symbiotic relationship in which one organism benefits and the other is unaffected
parasitism a symbiotic association in which one organism benefits while the other organism is harmed
coevolution the long-term changes that take place in two species because of their close interactions with one another
Created by: swhite2015
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