Humans and animals are considered as carbon based life forms. This means that carbon forms the backbone of biology for all life on Earth. Complex molecules are made up of carbon bonded with other elements, especially oxygen, hydrogen and nitrogen. It is able to bond with all of these because of its four valence electrons. It is often assumed in astrobiology that if life exists somewhere else in the universe, it will also be carbon based.
All living things are made of carbon. As a result, everything we eat has carbon in it (assuming that it came from a living thing).
At the same time, animals intake oxygen and release carbon dioxide, while plants absorb carbon dioxide and release oxygen.
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