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

Presence of antibodies in his blood
Lack 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
Ozone hole refers to

increase in the thickness of ozone layer in troposphere
hole in ozone layer
decrease in thickness of ozone layer in stratosphere
decrease in the ozone layer in troposphere

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