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the average weight of an adult is 70kg and average blood amount is 6l. Since blood has almost same density as water so weight of blood in average adult is 6kg.

so the % of blood in body weight =6/70 *100= 8.57%

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To agglutinate red blood cells is to clump them together with an antibody against something in the red cell membrane.

So, if blood cells of type A or type AB are mixed with antibodies against the type A substance, those cells will agglutinate. Likewise, if type B or type AB cells are mixed with antibodies against the type B substance, they will agglutinate. Type O cells are those that do not agglutinate when mixed with anti-A or anti-B antibodies.

If your red blood cells are type A, then you have in your blood antibodies to type B substance. If you're type B, you have antibodies to type A substance. If you're type AB, you don't have either kind of antibody, and if you're type O, your blood has antibodies to both type A and type B cells.

Hope this helps.

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