Mutualism is a relationship between two species in which both organisms benefit. Bees and flowers is an example; bees get food and flowers reproduce. Another example is clownfish; clownfish get protected from their predators, and anemone get protection from their's.
Parasitism is a relationship in which only one animal benefits. An example of this is humans and headlice; headlice get a place to live, and humans get an itchy scalp. Another example is some birds laying their eggs in other bird's nests.
In commenalism, both organisms receive neither benefits nor harms. An example of this is an orchid growing on a tree, where neither of them are interfering with each other's energy gathering.
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