1. Lithosphere : The surface or crust of the earth is called lithosphere. It accompany the mountains, ocean floors and the plain lands.
2. Population : A collection of individuals belonging to the same species occupying a given area at a given time is called population.
3. Biotic community : The living components are called biotic components.
Eg: plants, animals,bacteria, and fungi.
4. Food web : Since most organisms feed on more than one kind of food item. Every organism at even tropic level becomes linked to several food chain at the same time. A complex network of interconnected food chains forming a food web.
5. Tropic level :- Representation of the different levels of feeding in ecosystem is described as tropic levels.
