Why do finger nails grow more quickly than toe nails?

I suppose one possible explanation might be simple logic: out of an evolutionary perspective, we've always used our hands more (to grab and hold onto things, for instance), which would cause our finger nails to have to grow at a faster rate to keep up with wear and tear. However, if that were true, the length... show more I suppose one possible explanation might be simple logic: out of an evolutionary perspective, we've always used our hands more (to grab and hold onto things, for instance), which would cause our finger nails to have to grow at a faster rate to keep up with wear and tear. However, if that were true, the length of our finger nails and toe nails would still be comparable at any one point for precisely the same reason: the daily wear and tear on our finger nails would keep them shorter. So, what accounts for this disparity or possible contradiction?
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