Both Gregor Mendel and Alfred Wegener proposed ideas that were not accepted completely by the scientific community during their lifetimes. What did their ideas have in common? Choose one answer. A. They were presented by amateur scientists who were not accepted by the scientific community. B. They explained aspects of genetics that required Watson and Crick's data to be understandable. C. They needed mathematics to prove their data, and that field was not developed at the time. D. They required supporting evidence which could not be provided with the existing technology.