Evolution does not necessarily form species. ("species" based on the 'similar genes' definition) (1)

This applies to Meiofauna and probably to other large-populated organisms like bacteria. Latest theories have found that not even human cells within the same brain have the same genome. (2)

And the same applies for the gens into our body. (3)

Harmonia Philosophica (@Wordpress or @Blogger) has for a long time pointed out the subjectivity of definitions and the problems with the term "species". How can one built such an "important" theory of life based on something so subjective? When something is complicated, trying to simplify it ends in disaster.

Occam's razor needs replacement with something like... Occam's brain!