The third criteria is reproduction. Here again, this is based on the first criteria, observation. The last proof for a scientific proof is falsification. Finding out under what conditions it is possible in and those it is not possible in. It may be provable that in some circumstances evolution is not possible, but it cannot be proved that under certain circumstances evolution does happen.
Evolutionists even ignore certain animal species .
The shark is one, the duck billed platypus is another. These and other animals are a mosaic of different features. Evolution states that by finding similarities of organisms' features, we can trace the different species back to a common ancestor. Evolutionists seem to choose to forget that many of their fundamental things are based upon ideas, not proof. The evolutionary tree, branching from the amoebae into the most complex animals and humans, is based upon assumptions, not fossil records .