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Arteries carry blood away from the heart , veins carry blood to the heart and capillaries connect veins and arteries.

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The circulatory system runs all throughout our body and its main job is deliver nutrients to cells around the body and keep blood flowing.

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Where do the nutrients collected from food go?
Does the brain use these nutrients for itself?

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Do cells ever eat each other?

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How fragile are bones and cartilage

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Do cells ever interact with each other negatively.

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do cells eat?
why are something made out of cells and some are not?

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does tis determine fight or flight

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Does this determine if we are nervous or not

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If cells make up living things what are cells made of?

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Can cells die permanently?
Is everything on Earth made of cells?