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MediumZoologyBlood groups
+4 / -1

Choose the incorrect statement:

A
Persons with 'O' blood group have both anti-A and anti-B antibodies in plasma.
B

Erythroblastosis foetalis can occur if the mother is Rh positive and the fetus is Rh negative.

C
Serum is plasma without clotting factors.
D
Fibrinogens are needed for clotting or coagulation of blood.
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