Wednesday, August 17, 2011

commensalism

In ecology, commensalism is a class of relationship between two organisms where one organism benefits but the other is unaffected. There are three other types of association: mutualism (where both organisms benefit), competition (where both organisms are harmed), and parasitism (one organism benefits and the other one is harmed).
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talk nineteen to the dozen

  to speak rapidly and without stopping

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