What do you mean "Fairy Tales. No support."?? You didn't even read the references, let alone address them... this Science thing really isn't your strength now, is it? Perhaps you should try reading further than just the "Abstract" of the research? Just saying...
Further down (I know, you haven't read anything, because that sciency "research paper" thing might have knowledge, or something equally scary in it...), you'd read this:
"The exclusion of non-commensal bacteria
may have initiated the evolution of the alimentary canal and
therefore the evolution of higher organisms. The
water-land transition and terrestrial life also
required adaptations to air breathing,
resulting in the evolution of respiratory surfaces (originating from the alimentary canal) which faced the problem of providing sufficient gas exchange on the one hand and being exposed to microorganisms and particulate fouling on the other.
An
airway epithelium lined with mucus
evolved to serve as a particle and pathogen trap, preventing microbes from penetrating and infecting gas-exchanging regions in mammalian lungs. Mucus and trapped particles are cleared from the lungs by cilia- mediated mucus entrainment—essentially the same mechanism used for feeding by corals, filter feeding ascidians and bivalves and ciliary gliding by lower invertebrates.
36 Histological studies on
lungfish (
Neoceratodus forsteri and
Protopterus aethiopicus), the oldest
living ancestors of tetrapod vertebrates, revealed the presence of ciliated cells within the
intestine.
37 Furthermore, in
P. aethiopicus, ciliated cells and mucus secreting cells are present in the anterior parts of the
lungs,
37 suggesting that during vertebrate evolution, cilia-mediated mucus entrainment
might have been lost in the mammalian gut surface mucosa, whereas it developed into a highly efficient particle clearance system in the airways."