Just like Matthew said no one is sure why we have them but it has been suggested that they used to help funnel sound into our ears. This would make sure that we heard things more clearly and better. Nowadays people just use them to wear earrings.
I think we need time travel to go back and see what they were for years and years ago!
There have been a few suggestions as to why we have ears, one is to funnel sound into our ears like Louise said, another is that because they have a lot of blood vessels that they are there in part to keep us warm!
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