A close and often mutually beneficial relationship between two different organisms or interdependent parties.

From Greek symbiosis, a living together, from syn, together, plus bios, life.

mutualism interdependence cooperation partnership
antagonism parasitism independence conflict
"The symbiosis between pollinators and flowering plants sustains a large share of global food production."

Useful in GS3 environment answers on ecology and figuratively in GS2 and essay writing on cooperative federalism or state-market relations, for example, 'a healthy symbiosis between public research and private industry drives innovation.'

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