    Sentence 1:°What. previous .work. did  Lavoisier experiments discredit?    Senténce’ 2: Oxygen. was. discovered  independently by Cart Wilhélm,Scheele;in  Uppsala;- iri 1773 or earlier, and Josepti  Priestley:in Wiltshire, in 1774, but Priestley  is often given prioritly-because his work  was published first,