Another Just-So StoryOne of the most fundamental evidences for evolution is the similarities between the species. Evolution calls for the species to have evolved via a process of common descent leaving them with similarities inherited from their common ancestor. But there are several problems with this idea. One problem is that there are a great many similarities between species that could not have been inherited from a common ancestor. In such cases evolutionists say the similarities evolved independently. Evolution repeated itself because of a similar environment. But another problem is that there are many similarities between species with key environmental differences. One example is the vision system in humans and squids. Their respective environments could hardly be more different. Now a new study provides yet another example: venomous snakes of North America and Australia, which occupy different ecological niches. As one evolutionist explained:
Most biologists tend to assume that convergence in body form for a group of organisms implies that they must be ecologically similar. But our study shows that there is almost no overlap in diet between many of the snakes that are morphologically very similar.
Evolutionists explain these examples of convergence in different niches with ad hoc mechanisms. For one reason or another, similar designs arose independently, in spite of different environments. This highlights how flexible evolution is. It can explain a great variety of outcomes. But this also means that similarities between species are not the strong evidence evolutionists claim them to be. In fact what these data reveal is how difficult it is to falsify the theory.