More than half of the animal species, marine and terrestrial, are not considered to be free-living.

Name: More than half of the animal species, marine and terrestrial, are not considered to be free-living.
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Most animals are not considered to be free-living because they are involved with various forms of symbiosis. There are three types of symbiosis-mutualism, commensalism, and parasitism. Information can be found in the section Organisms in Communities Can Live in Symbiosis.

More Than Half of the Animal Species, Marine and Terrestrial