organism that use energy from the sun or energy stored in chemical compounds to manfacture their own nutrients.
organism that cannot make its own food and must feed on other organisms for energy and nutrients.
organisms, such as fungi and bacteria, that break down and absorb nutrients from dead organisms.
organism that represents a feeding step in the movement of energy and materials through an ecosystem.
model that shows all the possible feeding relationships at each trophic level in a community.
portion of Earth that supports life; extends from high in the atmospphere to the bottom of the oceans.
nonliving parts of an organism's environment; air currents, temperature, moisture, light, and soil are examples.
group of organisms all of the same species, which interbreed and live in the same place at the same time.
a community made up of interacting populations in a certain area at a certain time.
interactions among populations in a community; the community's physical surroundings or abiotic factors.
symbiotic relationship in which one species benefits and the other species is neither harmed nor benefited.
symbiotic relationship in which one organism benefits at the expense of another, usually another species.