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In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells
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The ocean produces oxygen through the plants (phytoplankton, kelp, and algal plankton) that live in it. These plants produce oxygen as a byproduct of photosynthesis, a process which converts carbon dioxide and sunlight into sugars the organism can use for energy.
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There are three food macro molecules which yield energy in the body, these are carbohydrates, fats and proteins. The fat gives the highest amount of energy inside the body. If one gram of a fatty food is eaten, it will produce 9 kilocalories. Thus, any food which fall into the class of fat and oil will yield the greatest energy within the cell.
