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Answers:Surface area and ability to flow within blood cells. The circular shape allows for the least viscosity (resistance).
Answers:having room for more oxygen, and other things for transport
Answers:i think its something to do with the round shape... when its round it gets through the veins easily but if it is out of proportion and odd it gets suck which causes blood clots... something like that ?
Answers:The first reason that comes to mind for the simple organization is that it allows the bone marrow to make red blood cells more easily (because they are relatively simple cells) and therefore the body can keep up production so that there is always a constant supply. Which is good because they are very important! It may also be simple in order to lessen its own need for energy to keep things efficient.