Evolutionary Tree

[Whateverist]

Science is the study of the natural world.  It literally doesn't deal with the supernatural by definition.  That's not an a priori bias.  That's just the nature of the inquiry.

And please, do give us an example where an a priori bias against the supernatural has interfered with a scientist's ability to follow the evidence.  I'm sure we could all use a good laugh.

I'd be a little more blunt and say that science deals in reality while the supernatural deals in unreality.

Right!  It is all natural, man!  Atoms, dreams, belief in gods, skepticism, hallucinations.  Real, real, real and real.  It isn't natural vs supernatural, it is natural vs nonexistent.