ECOLOGICAL RELATIONS

Simbiosis: Any of several living arragments between members of two different species, incluiding mutualism, commensalism and parasitism.  

  Parasitism: Relationship between individuals of two species in which one benefits at the expense of the other, sometimes without killing it. 

Mutualism: Assosiation between organisms of two different species in which each is benefited. 

Commensalism: Relation between individuals of two species : one species obtains food or other benefits from the other without ether harming or benefitingthe latter. 

Predation: One organism kills and consumes another.