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ORK
Lv 5
ORK asked in Science & MathematicsZoology · 1 decade ago

why rbc of fishes, amphibians and reptiles have nucleus?

The RBCs of aves and mammals don't have nucleus because of to carry more O2 molecules, but why the RBCs of fishes, amphibians and reptiles don't have nucleus in RBC

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  • PaulCyp
    Lv 7
    1 decade ago
    Favorite Answer

    So do the fetal RBC's of mammals, including humans. In mammals this characteristic is lost as the fetus grows.

    Source(s): biologist
  • Anonymous
    1 decade ago

    You'd think that birds, with their need for more oxygen, would lack the nucleus too, wouldn't you? It might just be one of those quirks of evolution.

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