There are several ways that the oceans are related to atmospheric carbon dioxide:
The ocean absorbs large amounts of atmospheric carbon dioxide, and is acidified thereby.
Forests and Oceans.
Oceans
No, mercury does not have large amounts of carbon dioxide. Mercury is primarily composed of the element mercury (Hg) and does not contain significant amounts of carbon dioxide.
The ocean absorbs large amounts of atmospheric carbon dioxide, and is acidified thereby.
The oceans contain about 50 times more carbon dioxide (CO2) than the atmosphere and 19 times more than the land biosphere.
The most prominant artificial cause of the acidification of the oceans is the release of carbon dioxide into the atmosphere. This causes the oceans to absorb the CO2, thereby increasing their acidity
Carbon dioxide goes through cycles of being dissolved in the oceans, until it reaches a supersaturated concentration. At that point, the oceans release it back into the atmosphere until a supersaturated concentration is produced, and the process starts over.
The oceans are another extremely important carbon reservoir. Carbon is stored in marine life, dissolved inorganic carbon, and as organic carbon in sediments at the bottom of the ocean. The oceans play a critical role in the global carbon cycle by absorbing and storing large amounts of carbon dioxide from the atmosphere.
Carbon Dioxide because without water you die and with carbon dioxide(concentrated in large amounts) you will have trouble breathing, or possibly die.
The sugar in the water would be consumed by bacteria rather quickly, which would release large amounts of carbon dioxide and possibly alcohol into the ocean.
The saguaro does not store large amounts of food. It does store large amounts of water with which it can use to produce food, along with carbon dioxide and sunlight.