How did the Barbie Doll help create the Action Figure?

How were Barbie and GI Joe toys created? What important role did the Ken doll play for both Barbie and GI Joe? How have Barbie and GI Joe evolved over the years? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info .