Symbiosis

A mutually beneficial relationship between different groups.

Mutualism

The teaching that mutual dependence is necessary to social well-being.

Example : A bee and a flower

Commensalism

An association between 2 organisms in which one benefits and the other derives neither benefit nor harm.

Example : A whale and barnacles

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Parasitism

It is a relationship between 2 things and one of them benefits from or lives off or each other.

Example : A flea(parasite) on a dog.