Rene Descartes argues that, while most of life is uncertain,

1. Rene Descartes argues that, while most of life is uncertain, he can prove–without a shadow of a doubt–that he exists. What proof does he offer to support this claim? Does Descartes believe that the body is a pre-requisite for existence? Why or why not? Please use your own words to answer these questions, rather than relying upon direct quotes.