•Mutualism is a biological interaction between two organisms, where each individual derives a fitness benefit.
An example - a bees polinate trees -- the bee gets food, the tree gets pollinated.
•Commensalism is the relation between two different kinds of organisms when one receives benefits from the other without damaging it.
An example -a flatworm attaching to the horsecrab and eating the crab's food while the crab is unaffected.
•Parasitism is the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it.
An example -a flea and a dog; flea gets home/food and the dog is harmed because the flea feeds on its blood
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