One of the factors required for the maturation of erythrocytes is 

1. vitamin - D

2. vitamin - A

3. vitamin - B₁₂

4. vitamin - C

A decrease in plasma albumin levels is likely to affect:

1. Clot formation

2. Oxygenation of hemoglobin

3. Osmotic balance

4. Immune functions

Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?

Serum differs from blood in 

1. lacking globulins

2. lacking albumins

3. lacking clotting factors

4. lacking antibodies

Which one of the following animals has two separate circulatory pathways?

1. Frog

2. Lizard

3. Whale

4. Shark