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B
Frog
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C
Both Rabbit and Frog
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D
Neither in Frog nor in Rabbit.
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Solution
The correct option is B Frog
Most mammalian red blood cells are highly evolved and have lost their nucleus. Unlike typical mammalian red blood cells, those from amphibians, such as frogs, contain a DNA-bearing nucleus that is visible in the center of the cell. all non-mammalian vertebrates have nucleated RBCs.