Summary

  • Symbiosis is a close relationship between two species in which at least one species benefits.
  • Mutualism is a symbiotic relationship in which both species benefit.
  • Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected.
  • Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed.