Why fish red blood cell contain nucleus but human red blood cell does not contain nucleus?



Answer:
so that we could differentiate them in microscopical nouns when we find blood sample at the scene of the crime & we wanna know if blood is human or not (medicolegal importance)
why? because fish r lower animals also hens, frogs RBC's doesn't contain nucleus, but humans are economically developed enough that their RBC's lost their nucleus (also camel lost them but their r to some extent oval while human r rounded)

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