The skeletal system includes all of the bones of the body and the tissues that connect them. The bones are held together by the connective tissues. Together they make a system. Bones, ligaments and cartilage are parts of the skeletal system. Bones give the body shape and support, as well as protecting organs and systems. Ligaments are made of tissue that holds bones together at the joints, and make it possible for a person to move their bodies. Cartilage is a cushion at the joints where bones come together. It helps prevent the bones from rubbing against each other and wearing out the bones.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.