All the organisms living in a place together with their environment.

a group of organisms of the same species in an ecosystem

consists of all the populations that live and interact in an area

the place an organism lives with in an ecosystem

an organism's complete role or function within it's ecosystem

all the non living things in an environment

all the living things in an environment

the gradual change of organisms in an ecosystem

Where an ecosystem begins at bare rock, from scratch

when an ecosystem has been disturbed but the soil, seeds and roots are still present

when all of the members of a certain species die and are no longer in existence

a foreign species that is introduced to and takes over the environment

the contamination of air, water, or soil by a substance harmful to organisms in their ecosystems

the variety of different species that live in an ecosystem

the protection of ecosystems and the organisms living in them

the average weather in an area over time

the struggle for resources in an ecosystem

the organisms that already live in an ecosystem

And organism that causes a red tide when present in large amounts