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Similarities between reptiles and Birds

State some similarities which reptiles and birds share regarding the reproduction, external coverage and excretion?

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As far as external coverage is concerned, this feature of the birds is same as that of the reptiles as they present impermeable keratinized coverages. Regarding reproduction, in both, fecundation is internal and the embryo gets developed within the shelled egg. Regarding excretion, both excrete the uric acid.

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