Answer: Red blood cells, also referred to as red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes, are the most common type of blood cell and the vertebrate's principal means of delivering oxygen to the body tissues—via blood flow through the circulatory system.
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3 all of above, because exercising reduces your chances of getting sick, you can inherit disease from your parents and being fat causes you to develop health problems, for example: diabetes, asthma, high blood pressure, etc.
The answer for this question is a.
