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Symbiosis is a dependent relationship between dissimilar organisms. Types of symbiosis include parasitism, mutualism, and commensalism. Although some would argue that "symbiosis" only refers to mutualism.
Parasitism
The relationship is harmful to one, but beneficial to the other.
- Anaphasic lifeform
- Interspatial parasite
- Nexian tapeworm
- Tarchannen III species
- Ves Alkar
Neural Parasites
- → See main article: Neural parasite
- Neural parasite (23rd century)
- Neural parasite (24th century)
- Xindi neural parasite
Social Parasitism
Parasitic behavior including non-organisms
Mutualism
The relationship is mutually beneficial to both organisms.
Commensalism
One organism benefits from the relationship, the other is not affected.