In order for the molecule to had made its way to the surface ocean the carbon is moved around from physical movement moving from place to place. When a fish dies in the surface ocean they float, here are some of my fish friends explaining more.
Deep ocean water currents flow in the deep ocean unlike the surface ocean who moves the carbon around. Speaking of the ocean surface, when a fellow fish dies they float or sink and this is death and decomposition
Enough about death, let me tell you about oxygen and our atmosphere. See the flowers? Plants and animals like me release gas and oxygen into the atmosphere. Speaking of decomposition what happens to land animals when they die?
In the soil, water is getting inside and setting down. When animal dies just like in the deep sea they soon begin to decay and sink down into the earth and soil
Like our country friend mentioned earlier, these plants that we eat go through photosynthesis during gas exchange.
The whole process before death and composition where happens right where im standing and in the deep ocean include of combustion,dissolving, and coming of solution of carbonic acid