In which species are red blood cells nucleated in adulthood?

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Multiple Choice

In which species are red blood cells nucleated in adulthood?

Explanation:
Red blood cells become enucleated as they mature in mammals, freeing space for more hemoglobin and improving flexibility for circulation. In fish—and other non-mammalian vertebrates—mature erythrocytes keep their nuclei. This difference reflects how erythropoiesis proceeds in different lineages. Among the options, the fish has nucleated red blood cells in adulthood. The other listed species are mammals, whose mature RBCs lack nuclei.

Red blood cells become enucleated as they mature in mammals, freeing space for more hemoglobin and improving flexibility for circulation. In fish—and other non-mammalian vertebrates—mature erythrocytes keep their nuclei. This difference reflects how erythropoiesis proceeds in different lineages. Among the options, the fish has nucleated red blood cells in adulthood. The other listed species are mammals, whose mature RBCs lack nuclei.

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