Give differences : carbon cycle and phosphorus cycle.

The reservoir pool of carbon is

What is the medium by which carbon cycle takes place?

Which one has the maximum biomass

Given below are four statements $(a-d)$ each with one or two blanks. Select the options which is correctly fill up the blanks into two statements.

$(a)$ Ecological succession is a...$(i)$... and fairly predictable changes in the ....$(ii)$... of a given area

$(b)$ Ecological succession, entire sequence of communities that successively change in given area are called ...$(i)$....

$(c)$ Primary succession occurs on...$(i)$...

$(d)$ Secondary succession is ...$(i)$... than primary succession