is it not a fact that organs that are not used degenerate and perish? if one never used more than one of one's ten fingers, the other nine would inevitably wither and become useless or die.

This is all lower case. Can you fix that?
Is it not a fact that organs that are not used degenerate and perish? If one never used more than one of one's ten fingers, the other nine would inevitably wither and become useless or die.