Cells are what keep you going and they are very important for our health and our immune system. the ones that help your immune system are called white blood cells, they fight off germs and sickness and it is a good and bad sign if you have alot of white blood cells
Changes in the size of population , age and race
Answer:
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Explanation:
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Muscular endurance. muscular= muscles, endurance= working something for long periods of time w/o getting tired.
