Symbiosis
By: Mack Goodman
Definition
interaction between two different organisms living in close physical association, typically to the advantage of both
Mutualism
symbiosis that is beneficial to both organisms involved
Commensalism
an association between two organisms in which one benefits and the other derives neither benefit nor harm.
Parasitism
non-mutual symbiotic relationship between species, the parasite, benefits at the expense of the other