Mutualism	Predation	Parasitism	Prey	Predator
A relationship between two species in which both species benefit.	An interaction between two species in which one species, the predator, feeds on the other species, the prey.	A relationship between two species in which one species, the parasite, benefits from the other species, the host, and usually harms the host.	An animal hunted or seized for food, esp. by a carnivorous animal.	Any organism that exists by preying on other organisms.

Commensalism	Competition	Equilibrium	Ecosystem	Population Density
A relationship between two organisms in which one organism benefits and the other is unaffected.	The relationship between species that attempt to use the same limited resource.	The harmonious coexistence of organisms and their environment	A community of organisms and their abiotic environment	The number of individuals of the same species that live in a given unit of area.

Abiotic	Biotic	Biodiversity	Exponential Growth Curve	Carrying Capacity
An environmental factor that is not associated with the activities of living organisms.	An environmental factor that is associated with or results from the activities of living organisms.	The number and variety of organisms in a given area during a specific period of time.	A curve in which the rate of population growth stays the same and as a result the population size increases steadily.	The largest population that an environment can support at any given time.