| ecosystem | a grouping of different organisms living together, interacting with both the living and non living components found in the environment around them |
| ecology | the interrelationship of lving organism and their environment |
| population | a group of individuals of the same species living in the same area |
| community | the interacting populations within an area |
| competition | a community interation that occurs any time two or more organisms vie for the same resource |
| predator | an organism that eats another organism |
| predation | when on organism, the predator, eats another organism, the prey |
| symbiosis | permanent relationship between two or more different types of organisms in which at least one of them benefits |
| mutualism | a relationship between two living organisms that is beneficial to both |
| commensalism | interaction in which one organism benefits while the other is neither harmed or benefits |
| parasitism | when one organism benefits at the expense of the other |
| parasite | an organism that benefits at the expense of another organism (the host) |
| host | an organism that is harmed while another organism benefits |