Charles Darwin about adult (“On The Origin of Species”, 1859) - It has already been stated that various parts in the same individual, which are exactly alike during an early embryonic period, become widely different and serve for widely different purposes in the adult state.
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It has already been stated that various parts in the same individual, which are exactly alike during an early embryonic period, become widely different and serve for widely different purposes in the adult state.
 Charles DarwinOn The Origin of Species (1859). copy citation

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1859
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