In the phosphorus cycle, phosphate becomes available by weathering of rocks first to

How much carbon is dissolved in the oceans (in $; \%$)?

In an aquatic food chain,at which trophic level can a whale be placed?

Which of the following organisms convert plant matter into animal matter?

Which of the following is $NOT$ a major functional aspect of an ecosystem?

Some of the nutrient cycles are labelled as below:
$I$. Sulphur cycle
$II$. Phosphorus cycle
$III$. Carbon cycle
$IV$. Nitrogen cycle
Of these,the sedimentary cycle is represented by: