It literally means “together life”. It refers to organisms that live in close approximation; often they cannot live without each other. Top flap)
Relationship in which one organism (the host) is the source of food and/or shelter for the organism (the parasite) *Parasite benefits/ Host is harmed* Examples: Tick feeding on blood of a dog Head lice on human scalp Tape worm in intestines Mistletoe putting roots into host tree. http://www.youtube.com/watch?v=5d DjmkWojE8
Neither species is hurt in anyway, they both receive a benefit from the relationship. *Both Benefit* Examples: Bees and Flowers Bacteria living in cow’s intestines, help break down cellulose. Honey guide bird leads honey badger to honey, they both eat.
One organism benefits from the relationship while the other is neither helped or harmed. *one benefits/one not helped or harmed* Examples: Barnacles living on a whale Remoras attach themselves to a sharks body. They eat sharks food scraps and have protection.