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What is a relationship of mutual benefit or dependence? · HackerTrans

What is a relationship of mutual benefit or dependence?(wiki.answers.com)

1 points·by leroya·vor 16 Jahren·0 comments

wiki.answers.com

What is a relationship of mutual benefit or dependence?

http://wiki.answers.com/Q/What_is_a_relationship_of_mutual_benefit_or_dependence

1 comments

copernicus·vor 16 Jahren

Symbiosis: http://en.wikipedia.org/wiki/Symbiosis