A living thing.
The place where an organism lives and where it obtains all the things it needs to survive.
A living part of an organism's habitat.
A nonliving part of an organism's habitat
All the members of one species in a particular area.
All the different populations that live together in an area.
The community of organisms in an area, along with their nonliving environment.
Includes all living things found from the deepest parts of the ocean to the upper atmosphere.
Moving into a population.
Leaving a population.
An environmental factor that causes a population to decrease.
The largest population that an area can support.
An organism that can make its own food.
An organism that obtains energy by feeding on other consumers.
A consumer that eats only plants.
A consumer that eats only animals
A consumer that eats both plants and animals.
A carnivore that feeds on the bodies of dead organisms.
An organism that breaks down wastes and dead organisms.
A series of events in which one organism eats another and obtains energy.
The pattern of overlapping food chains in an ecosystem.
A diagram that shows the amount of energy that moves from one feeding level to another in a food web.
A behavior or physical characteristic that helps an organism survive in its environment.
The role of an organism in its habitat, or how it makes its living.
The struggle between organisms to survive using the same limited resources.
An interaction in which one organism kills another for food.
The organism that does the killing in a predation interaction.
An organism that is killed and eaten by another organism.
A close relationship between two species that benefits at least one of the species.
A relationship between two species in which both species benefit.
A relationship in which one species benefits and the other is neither helped nor harmed.
A relationship in which one organism lives on or in a host and harms it.
Organism that benefits by living on or in a host.
Organism that a parasite lives in or on.