Originally Posted by Capuchin
Firm, there are many cases of imperfection in the wild, for example the vestigial hind legs of a whale. Evolution describes these structures well. How did a perfect designer come to design such organs with no use?
The main evidence for a single common ancestor is DNA and genes, nothing to do with water content. We are so genetically similar to other animals, with only relatively few genes defining the species. There are other evidences, but DNA is remarkably powerful. The vast majority of organisms life off oxygen and water, except for those that were forced into an ecological niche where one of these was absent. Why didn't God make more nitrogen-based creatures, since he decided to put so much nitrogen in our atmosphere?