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" ... De Groote and colleagues found gravel consistent with the Piltdown site in some of the teeth and skull bones, which would be expected in a specimen found in situ at a site, but they also found that modern putty held the gravel in place. Micro-CT scanning and focus-variation microscopy of the lower jaw revealed that the molars had been taken out of the jaw in order to file down both the cusps and the roots, to make the ape teeth look more like human teeth. ... "
" ... Mammals, on the other hand, have teeth with numerous cusps --like molars--that occlude during chewing, and this act is known as mastication. This allows food to be broken down and easily digested, and also allows them to exploit a wider array of food resources. ... "