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It seems odd that some snakes are oviparous, and others give birth alive. What determines this difference? It would seem logical that all snakes would give birth in the same manner, as mammals do.

Actually, all snakes do have eggs, the difference is that in some snakes the eggs hatch inside the female and emerge that way, instead of her laying the eggs first. As for why this is, last I heard scientists will still working on a foundational answer to that question.

Grace Fields

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