Maximum contribution of $O_2$ is from

The exchange pool in the carbon cycle is:

Give scientific reasons: Coral reefs are not found in the regions from West Bengal to Andhra Pradesh,but are found in Tamil Nadu and on the east coast of India.

The components of an ecosystem include .......... .

Carbon constitutes . . . . . . of dry weight of organisms and . . . . . . percentage is dissolved in oceans out of total global carbon.

Choose the correct sentence regarding the carbon cycle.