Can you provide an explanation for the difference in depth at which sharp reductions in calcium carbonate occur in Ocean A and in Ocean B?

(b) The sharp reduction in calcium carbonate below a depth of about 4000 meters in ocean A is due to increase carbonate dissolution. Carbonate dissolution results from the corrosiveness of seawater, which increases as temperature decreases, pressure increases and carbonate-ion content decreases.

Explanation:

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

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