please write an article about the evolution of human feet. Compared with other primates, humans no longer climb very often, and our feet are far less frequently used than our hands. In this paper, I will study what changes have been made to human feet and what changes they will make in the future. Among them, I am more concerned about whether toes and toenails will become useless tissues in future humans just like appendices, etc. requirement down below.
please use MLA format, and make some research of evolution of human feet.