Persons with blood group $A$ contain:

  • A
    Antigen $A$ and antibody $b$
  • B
    Antigen $A$ and antibody $a$
  • C
    Antigens $A$ and $B$ and no antibodies
  • D
    No antigens and both $a$ and $b$ antibodies

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When the blood of one person is mixed with the serum of another person,in certain cases,clumping of $RBCs$ takes place. This clumping is due to:

Which vitamin helps in blood clotting?

Blood group $O$ has:

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