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This is an incomplete list of notable mutualisticsymbiotic relationships, in which different species have a cooperative or mutually dependent relationship. This relationship can be endosymbiotic, whereby an organism resides in another's body or cells.
Some of these relationships are so close that we speak of the composite of two species as one unit; for example, we speak of the composite of algae and fungi as lichens. This is analogous to our speaking of a modulator and a demodulator as a modem.
^Matthias Habetha et al. The Hydra viridis / Chlorella symbiosis.
^R.K. Trench, J.E. Boyle and D.C. Smith (1973). "The Association between Chloroplasts of Codium fragile and the Mollusc Elysia viridis. I. Characteristics of isolated Codium chloroplasts". Proceedings of the Royal Society of London. Series B, Biological Sciences 184 (1074): 51–61. doi:10.1098/rspb.1973.0030.
^Douglas, A E (1998). "Nutritional interactions in insect-microbial symbioses: Aphids and their symbiotic bacteria Buchnera". Annual Review of Entomology43: 17–38. doi:10.1146/annurev.ento.43.1.17. PMID15012383. ISSN 00664170.|accessdate= requires |url= (help)