A type of ecological succession that occurs in an area where topsoil already exists and organisms have lived before.

producers, primary consumers, secondary consumers, etc.

The total mass of all the organisms on a trophic level of an ecological pyramid – the greatest biomass is in the producers at the bottom.

An organism that makes its own food--usually plants

A difference among organisms of the same species in a population, like size or coloring

An organism in the first trophic level that consumes the producers

The group of organisms that exists in an area when ecological succession has reached a stable balance.

An interaction among organisms in which both organisms benefit.

The ability of an ecosystem to survive and maintain a balance among the organisms. Can be disrupted by events like wildfires, droughts, and floods.

A type of ecological succession that occurs when organisms develop in an area that has never been inhabited

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