In an ecosystem,the lithosphere is concerned with:

The local water cycle involves which of the following?

Define self-sustainability in the context of an ecosystem.

What will be the $P/R$ ratio of a climax community and a pioneer community? What explanation could you offer for the changes seen in the $P/R$ ratio of a pioneer community and the climax community?

Which of the following is the most stable ecosystem?

The species that appear first in a bare area are called: