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ecology
the study of the interrelationships of organisms and their nonliving environment. "study of our house"
community
all the interacting populations within an ecosystem
predator
an animal that obtains food primarily by killing and consuming animals
prey
an animal taken by a predator as food
intraspecific competition
interaction in population ecology, whereby members of the same species compete for limited resources.
interspecific competition
members of different species compete for a shared resource.
symbiosis
a close interaction between organisms of different species over an extended period of time. Includes parasitism, commensalism, and mutualism.
mutualism
a symbiotic relationship in which both participating species benefit ( + +)
commensalism
symbiotic relationship in which one species benefits and the other is neither helped nor harmed (+ 0)
parasitism
a symbiotic relationship in which one organisms (commonly smaller and more numerous than its host) benefits by feeding on the other, which is normally harmed but not immediately killed (+ -)
Ecto-parasite
An organism, generally an arthropod, that attaches to or lives on the skin of its host and derives nutrients.
Endo parasite
parasite that lives inside its host
altruism
behavior by an animal that benefits others of its species but that is not beneficial to or may be harmful to itself
Reciprocity
behaviors in which individuals help other group members out with the expectation that they will be helped in return
Cooperation
behaviors that improve the fitness of both individuals