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symbiosis
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symbiosis
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symbiosis
symbiosis Clownfish (Amphiprion) amid sea anemones (Heteractis magnifica), Great Barrier Reef, Australia. The two species protect each other from predators in mutual symbiosis.

symbiosis

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Also known as: symbiont
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symbiosis, any of several living arrangements between members of two different species, including mutualism, commensalism, and parasitism. Both positive (beneficial) and negative (unfavourable to harmful) associations are therefore included, and the members are called symbionts.

Any association between two species populations that live together is symbiotic, whether the species benefit, harm, or have no effect on one another.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Adam Augustyn.