Question

What is the use of carbon dioxide in marine organisms?

Answer 1

Carbon is the most fundamental component of life, and these one-of-a-kind elements can be found all across the planet. Carbon is found in plants and animals on Earth, as well as in the ocean, the atmosphere, and the planet's bedrock. In a complex cycle, a carbon atom may spend millions of years travelling across Earth.

Complete explanation
The ocean contains massive levels of carbon—roughly times that found in the atmosphere. The ocean is occasionally referred to as a carbon sink because it attenuates carbon from the atmosphere. It absorbs carbon through biochemical mechanisms. Carbon dioxide from the environment dissolves in the water at the surface of the ocean.
Phytoplankton, which are microscopic sea plants, use this carbon dioxide for photosynthetic activity. Phytoplankton play a major part in the food web of aquatic environments. Animals either exhale or transmit carbon up the food chain after eating plants. Phytoplankton can sometimes die, disintegrate, and be regenerated in surface water bodies. Phytoplankton can also descend to the ocean's depths and become encased in sedimentary basins. This action has made the ocean floor the world's greatest carbon reservoir over lengthy time scales.

Note:
Carbon dioxide is significantly less prevalent than oxygen or nitrogen. Marine animals utilize carbon in a variety of ways. Photosynthesis by phytoplankton is the most effective approach, in which carbon dioxide and sunlight are combined to form sugars and a waste product of oxygen. Carbon can also be found in the shells of animals in the form of calcium carbonate.