Identify the plant belonging to the reed-swamp stage in hydrarch succession.

Phytoplankton consists of:

In a pond ecosystem,diatoms represent

What is the natural reservoir of phosphorus?

Consider the following statements about the carbon cycle and choose how many statements are correct?
$(a)$ The atmosphere contains $71\;\%$ of the total global carbon.
$(b)$ Decomposers contribute substantially to the $CO_2$ pool by processing waste materials and dead organic matter from land or oceans.
$(c)$ $4 \times 10^{13}\; kg$ of carbon is fixed through photosynthesis annually.
$(d)$ There is no respiratory input into the atmosphere.
$(e)$ Carbon constitutes $49\;\%$ of the dry weight of organisms.

What regulates the rate of function of an ecosystem?