Depends on the nature of the coma. They may be able to breathe on their own or they may need a machine to do their breathing for them. The thing that controls the heart beating is in the heart itself, so it can go on beating as long as it has oxygen while in a coma.
In cases of brain death, many functions just won’t work at all even if they can keep a person on a respirator, so they’ll still die.
If female, she’ll keep menstruating. If a child, they will grow and reach puberty.
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