Mary Barber
... that Mary Barber discovered that natural selection caused penicillin resistance to increase in Staphylococcus bacteria?
... that <b id="mwC6Y"><a href="./Mary_Barber_(bacteriologist)" id="mwC6c" rel="mw:WikiLink" title="Mary Barber (bacteriologist)">Mary Barber</a></b> discovered that <a href="./Natural_selection" id="mwC6g" rel="mw:WikiLink" title="Natural selection">natural selection</a> caused <a href="./Penicillin" id="mwC6k" rel="mw:WikiLink" title="Penicillin">penicillin</a> resistance to increase in <i id="mwC6o"><a href="./Staphylococcus" id="mwC6s" rel="mw:WikiLink" title="Staphylococcus">Staphylococcus</a></i> bacteria?