Bow 9

Predator /Prey: An animal who does on its prey,feeds on its prey (the organism that is attacked).^[1] Predators may or may not kill their prey prior to feeding on them, but the act of predation always results in the death of its prey and the eventual absorption of the prey's tissue through consumption.

http://scienceray.com/biology/zoology/extreme-hunters-savage-predators-of-the-animal-kingdom/

Parasitism: A relation between organisms in which one lives asa parasite on another.

http://lesliesierra17.blogspot.com/2011/05/blog-9define-different-forms-of.html

Mutualism: a relationship between two species of organisms inwhich both benefit from the association.

http://jesuschuy27.blogspot.com/2011/04/blog9.html

Commensalism : A type of relationship between two species of aplant, animal, fungus, etc., in which one  lives with, on, or inanother without damage to either.

http://corpcloset.blogspot.com/2008/12/commensalism.html