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ecological relationship
An Ecological relationship is the relationship between organisms in an ecosystem. All organisms in an ecosystem are connected. Each interaction depends on the one before it. Each population interacts with one another in a complex web of relations. Ecological relationships help better describe how they are connected.
There are six ecological relationships in which two are oppositional and four are symbiotic. The oppositional relationships are predation and competition. The symbiotic relationships are mutualism, commensalism, amensalism, and parasitism.
The ecological relationship an organism has depends on the way the organism adapted to its environmental pressures on evolutionary bases.
==Oppositional relationships==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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