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B
Lizard
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C
Man
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D
Birds
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Solution
The correct option is D Man
In man, the blood cells without nuclei are erythrocytes or Red blood cells. When the RBCs are developing in the red bone marrow, they do have nuclei. However, these nuclei are ejected from the cells when they enter the bloodstream in a process known as enucleation. Hence RBC that lack nuclei when they are mature, are of man.