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Answer:
Your circulatory system delivers oxygen-rich blood to your bones.
Meanwhile, your bones are busy making new blood cells.
Working together, these systems maintain internal stability and balance, otherwise known as homeostasis.
Explanation:Brainliest plz
Answergo get a heart monetor
Explanation:
21 BMI is considered underweight
A) Because adequate sleep is as important to fitness as exercise is to healthy living