The establishment of new biotic communities on newly cooled lava indicates which of the following?

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?

The largest ecosystem of the world is .........

Choose the ecosystem services.

Identify the main decomposers of an ecosystem.

Plant succession is a ............. process.