we have fingernails because they are easier to trim to enable us to keep them short so we can use tools with utmost dexterity. ever see a lady with 4 inch nails work? they are basically useless. its an evolving trait that the body uses to expel dead cells.
So true.
http://www.youtube.com/watch?v=z4Ep6U0EN1g
http://t2.gstatic.com/images?q=tbn:ANd9GcSl2_5zcqqdDNBiHqxZflUAHxP3EU5ApqPbKlMf6HxQDADAHrvn ~ MONKEY FINGERNAILS and then http://universalspectrum.org/forum/attachment.php?attachmentid=189&d=1336375640 Baby marmoset claws ~ world’s smallest monkey.