Biology
A person with 'AB' blood group is sometimes called a universal recipient because of the

Lack of antibodies in his blood
Presence of antibodies in his blood
Lack of antigen in his b lood
Lack of both antigen and antibodies in his blood

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Biology
Function of pace maker is

To initiate heart beat
To regulate the process of digestion
To regulate the formation of urine
To start the process of respiration

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