black goo/acid blood

I think we've all reached a point where we are fairly certain David did not create the xenomorph.But i don't think we've completely shot down the idea that they were created.Take for instance the molecular acid for blood,When Milburn was attacked by the hammerpede,Fifeld attempted to cut it off with a knife and was subsequently showered in acid.If the black goo isn't responsible for the Xenomorph,then how did the hammerpede get the acid blood?Will the neomorph or the protomorph bleed acid?Would the deacon have bled a acid were it wounded?