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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.
Hope this helps!
Smoking is bad perharps, but it can cause a big effect on lung growth. Which can lead to respiratory problems and infections, shortness of breath and can cause a big effect when playing any type of sports. hope this helps.
Energy in a system is doing work such as kinetic and potential energy, that helps things move. Also more such as chemical, heat, thermal, etc.
