Charles Darwin studied for eight years to write a 4-volume work about which creatures?

I have some barnacle shell clusters. Cleaned up they are a beautiful purple and white cluster with each shell in the cluster resembling a demitasse teacup

888777crazylady, God was definitely smarter and science has proven that evolution dissent explain how we got here.there had to be a creator

Creation versus Evolution. Who was smarter? God or Darwin?