Scientists have determined that the chicken came first. How do they know that? To form the egg shell, there needs to be a protein in the ovaries of the chicken, which means that at some point, there was an animal that developed this protein and was able to lay eggs. So the chicken did indeed come first.
It's fun to know that, but the article points out that there are potential applications for this knowledge. But for a Friday after quitting time, I'll go for the baseline idea and be happy right with that.