Which one has enucleated erythrocytes

Earthworm

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Sepia

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Frog

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Rat.

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Solution

The correct option is D Rat.
Enucleated erythrocytes are present in the blood of all mammals, suggesting that enucleation provides an evolutionary advantage.
Enucleation allows the red blood cell to contain more haemoglobin and therefore, carry more oxygen molecules. It also allows the cell to have its distinctive bi-concave shape which aids diffusion. This shape would not be possible if the cell had a nucleus.
So, it is present in RAT then the correct option is (D)

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