Symbiosis is simply defined as a very close relationship
between two different species of organisms. There can be many different types of
symbiosis.
In some types of symbiosis, the two species both
benefit from the relationship between them. This is called mutualism. An example of
this is the relationship between some species of wrasses and other fish. The wrasses
"clean" the other fish, eating parasites and other things that irritate the other
fish.
Another kind of symbiosis is commensalism. In this
case, one species benefits and the other is unaffected. An example of this would be a
remora attaching to a shark and getting food from what the shark
eats.
The marietta.edu link below provides many more
examples of various types of symbiosis.
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