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