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Noah's ark was probably originally a famine narrative.

After the Babylonian captivity we see the Babylonian flood mythos in the extant version of the story.

Sometimes similarities between world religions can be explained by common physical features, like stories of resurrection associated with snakes (who shed skin) or with the planet Venus (which dips below the horizon for several days before reemergence).

But sometimes it's because people are just plagiarizing.