Energy enters an ecosystem through

Biogeochemical cycling refers to the cycling of

Identify the pioneer species that colonize bare rock.

The entire sequence of communities that successfully change in a given area is called $P$. The individual transitional communities are termed as $Q$.

The climax community is ultimately determined by which of the following?

Composition and structure of communities constantly change in response to the changing environmental conditions. These changes lead finally to a community that is in near equilibrium with the environment and that is called a.......