In comparison to human erythrocytes, frog’s erythrocytes are

The correct answer is nucleated and with haemoglobin.

To understand the difference between human and frog erythrocytes (red blood cells), we can compare their structural and functional features:

1. Presence of a Nucleus:
- Human Erythrocytes: Mature human red blood cells are enucleated (they lack a nucleus). This adaptation provides more internal space to accommodate hemoglobin, maximizing their oxygen-carrying capacity, and gives them a biconcave shape which aids in flexibility through narrow capillaries.
- Frog Erythrocytes: Frog red blood cells are nucleated. They retain their nucleus even when mature, which makes them oval and biconvex in shape.

2. Presence of Haemoglobin:
- Both human and frog erythrocytes contain the respiratory pigment haemoglobin, which binds to oxygen and gives the blood its characteristic red color. Frog erythrocytes do not lack haemoglobin.

Therefore, in comparison to human erythrocytes (which are enucleated and contain haemoglobin), frog’s erythrocytes are nucleated and with haemoglobin.