$A$ plant that is eaten by a herbivore,which is subsequently eaten by a carnivore,forms a/an ........

Phytoplankton $\rightarrow$ Submerged plant stage $\rightarrow$ Floating plant stage $\rightarrow$ Reed-swamp stage $\rightarrow$ Marsh-meadow stage $\rightarrow$ Scrub $\rightarrow$ Forest. What type of succession does this sequence represent?

Explain the carbon cycle.

What does the upper layer of a marine aquatic ecosystem contain?

$A$ trophic level is formed by ...........

Which ecosystem has the highest biomass?