I believe that the answer to the question asked above is that Darwin learned that the organism on earth come from one organism that grows and adopted to the chance in environment and transformed into new organism.
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Answer
If we look at dry mass it is made by Carbon (45%) and oxygen (45%).
As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules. The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream, which delivers them to the rest of the body.
