A cell is the smallest structural and functional unit of an organism.
The difference between a plant cell and an animal cell is that a plant cell has a different cell membrane than an animal cell. Also an animal cell dosen't have any chloroplast.
Muscle: a band or bundle of fibrous tissue in a human or animal body that has the ability to contract.
Nerve: a whitish fiber or bundle of fibers that transmits impulses of sensation.
Bone: any of the pieces of hard, whitish tissue making up the skeleton in humans and other vertebrates.
The muscles in your stomach make you be able to digest food.
digestive system: The organs and glands in the body that are responsible for digestion.
circulatory: responsible for transporting materials throughout the entire body.
respiratory: is made up of the organs in your body that help you to breathe.