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Nana76 [90]
3 years ago
5

A leading cause of blindness in the world today (excluding accidents) is a dietary deficiency of question 27 options: vitamin

Biology
1 answer:
Yuliya22 [10]3 years ago
8 0
Well, the answer is A.) Vitamin A 
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ABO blood grouping system is based on presence or absence of three types of antigen on red blood cells. A and B blood group have A and B antigens respectively. AB blood group has both A and B antigens. O blood group does not have any antigen.

A body with particular blood type will consider other blood group foreign ( because it has different antigen ) and produce antibodies against it. A person with blood type A can not be given B type blood because the antibodies in his body will destroy RBCs with B antigen which may even prove fatal.

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