"Why did God need to use a rib to create Eve?"


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When God creates Adam, the Bible says he created him from dust and then breathed life into him. Why then, when it comes to the creation of Eve, does God have to use a rib? Could he have used one of Adam's fingers, or his tailbone? Why did he need anything from Adam at all? 

There is also the biological question of how could Adam's rib, which contained Adam's DNA, have created anything other than a copy of Adam?

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Referenced Verses
Genesis 2:21, Genesis 2:22