Answer:
1, to strengthen the bone
2, I would say it causes them to tense up (contract)
Yes A is the correct answer
Everything explodes without it. One sentence :)
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Answer:
They're made of more than one cell
Explanation:
Answer:
Your kidneys also remove acid that is produced by the cells of your body and maintain a healthy balance of water, salts, and minerals—such as sodium, calcium, phosphorus, and potassium—in your blood. Without this balance, nerves, muscles, and other tissues in your body may not work normally.