C. Mass
Mass is the amount of matter in an object.
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Pandemics occur over a wide geographic region, potentially affecting a large population.
Answer:
Why the red blood cell disc in shape is because that is how blood cells carries oxygen around. This is why blood type is important, and how people with a blood type of AB negative is so rare, this is because the AB negative blood cells doesn't have the shape to carry the oxygen needed for the body.
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