$A$ frog,which feeds on insects,is a

Consider the following statements concerning food chains.
$I$. Removal of $80\; \%$ tigers from an area resulted in greatly increased growth of vegetation.
$II.$ Removal of most of the carnivores resulted in an increased population of deers.
$III.$ The length of food chains is generally limited to $3$ to $4$ trophic levels due to energy loss.
$IV.$ The length of food chains may vary from $2$ to $8$ trophic levels.
Which two of the above statements are correct?

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

Identify the mismatched event from the following structures.

Choose the correct sentence regarding the carbon cycle.

Which of the following statements is incorrect?