The area where two ecosystems overlap each other is known as:

During ecological succession,

The area where succession can take several thousand years to reach a climax community is:

The dominant second trophic level,in a lake ecosystem,is

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.......

The circulation or cycling of elements in an ecosystem is known as