The process by which an organisms internal environment is kept stable in spite of changes in the external environment is called _________________.

A baby's skeleton is made of

What is the function of melanin?

Which type of muscle tires quickly during exercise?

The injury in which a bone comes out of its joint is called a

Nerves and blood vessels in the skin are located in the

The bones that form the backbone are called

Skeletal muscles must work in pairs because

Which of the following is NOT a function of the skeleton?

How does the skin help regulate body temperature?

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