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- an association of members of two or more species (not truly parasites) that live in, on, or with each other, and usually partake of the same food
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- The close association of two or more dissimilar organisms where the association is advantageous to one and doesn't affect the other(s).