What is the main function of the skeletal system?, it supports the body, protects organs, and helps in movement., What are bones made of?, Bones made of a hard outer layer and a spongy inner layer., What is the role of joints in the body?, Joints connect bones and allow movement., What is a muscle?, A muscle is a tissue that contract and relax to help the body move., What are the main types of joints?, Hinge joints, ball and socket joints, and fixed joint..

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