Succession showing changes in communities at a place is called

Initial seral stages in ecological succession:

The community that starts the succession in a particular area is called the .......

In an ecosystem,primary consumers are ..............

Which of the following cannot be included in the functional aspects of an ecosystem?

What is a biogeochemical cycle? What is the role of the reservoir in a biogeochemical cycle? Give an example of a sedimentary cycle with a reservoir located in the Earth's crust.