Don't try to interpret them. We are approaching these from the standpoint of ordinary experience. Hands, feet, head, heart, liver, are parts of a living body. Vitamins, minerals, chemicals, proteins exist in a living body. Vitamins, minerals, chemicals, proteins are parts of a living body.
Form is a thing.
Some actions of the living body, such as eating and nourishing, cannot not be explained without recourse to the form or organization.