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Answer for the clue "The relation between two different kinds of organisms when one receives benefits from the other without damaging it ", 12 letters:
commensalism

Word definitions for commensalism in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Commensalism \Com*men"sal*ism\, n. The act of eating together; table fellowship.

WordNet Word definitions in WordNet
n. the relation between two different kinds of organisms when one receives benefits from the other without damaging it

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1870, from commensal + -ism .

Wikipedia Word definitions in Wikipedia
Commensalism , in ecology , is a class of relationships between two organisms where one organism benefits from the other without affecting it. This is in contrast with mutualism , in which both organisms benefit from each other, amensalism , where one is ...

Wiktionary Word definitions in Wiktionary
n. 1 (context biology English) A sharing of the same environment by two organisms where one species benefits and the other is unaffected. An example is barnacles on whales. 2 The act of eating together; table fellowship.

Usage examples of commensalism.

For each, we have to ask, is this parasitism, commensalism, or symbiosis?

Yet the crux of it was this: If Fee was right and the Extro had indeed taken possession of Guess, plus all the other electronics in the world, what would be the outcome of this commensalism, collaboration, symbiosis or, most probably, parasitism?

Then there is commensalism, where two organisms coexist but provide neither harm nor obvious benefit.

Who knows, maybe it's even reached a level of commensalism with its hosts -- attacking invading organisms for them, or .