$Serum = .........$

Erythrocytes in camel are

$A$ significant decrease in the number of lymphocytes due to a deficiency of folic acid is known as:

The $WBC$ count of a person's blood sample is $8000/cu.mm$. How many eosinophils and lymphocytes would be in the same blood sample approximately?

Which of the following is true for blood group '$O$'?

$A$ person with an unknown blood group under the $ABO$ system has suffered significant blood loss in an accident and requires an immediate blood transfusion. $A$ friend,who has a valid certificate of their own blood type,offers to donate blood without delay. What would be the blood group of the donor friend?