What percentage of incident solar radiation is converted into gross primary productivity by producers in an ecosystem?

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

The function of producers in an ecosystem is to .........

Composition and structure of communities constantly change in response to the changing environmental conditions. These changes lead finally to a community that is in near equilibrium with the environment and that is called a.......

What are ecosystem services?

$...........\%$ of the total global carbon is found dissolved in the oceans. (in $\%$)