What is the relationship between co2 and o2 for urchins?

The increase Carbon dioxide affect the calcification process of the Sea urchin's adults and larva. Oxygen is absorbed from the water.

Sea Urchin :

They are found in the ocean and their exoskeleton is made up of calcium carbonate. They absorb Carbon dioxide from the water to form calcium carbonate. They release Carbon dioxide from anus as waste.

The oxygen in the Sea urchin is absorbed from the water. The oxygen diffuse in the canals. From canals, oxygen diffuses in the cells.

The increased Carbon dioxide can increase the pH of the ocean. Increased pH negatively affect the calcification process.

Therefore The increase Carbon dioxide affect the calcification process of the Sea urchin's adults and larva.

To know more about Sea urchins,

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Sea urchins have a unique relationship of oxygen and carbon-di-oxide.

Explanation:

Sea Urchins spread oxygen in a unique way. They take in oxygen by staying inside water. Oxygen enters the body through their gills and tubed feet. CO2, which is waste is released through the anus. They get oxygen only through diffusion, i.e. diffusion of oxygen into the organism. Oxygen diffuses in body through the canals and carbon dioxide diffuses back into the canals. Urchins also have the capability to cope up with rising CO2 levels in the sea.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."