Globulins contained in human blood plasma are primarily involved in:

Mature human $RBCs$ are enucleated. Which of the following is the most appropriate explanation for this?
$(i)$ They do not need to reproduce.
$(ii)$ They are somatic cells.
$(iii)$ They do not perform metabolism.
$(iv)$ Their internal space is available for $O_2$ transport.

Mature erythrocytes are enucleated in the following animals $EXCEPT$:
i. Rat
ii. Monkey
iii. Llama
iv. Camel
v. Elephant
Choose the correct answer from the options given below.

Which of the following are required for blood clotting in mammals?

Which of the following conditions cause erythroblastosis foetalis?

Persons with blood group $A$ contain: