Paul Zweifel
...that in 1876, Paul Zweifel became the first to demonstrate that the fetus in utero consumes oxygen?
...that in 1876, <b id="mwBl0"><a href="./Paul_Zweifel" id="mwBl4" rel="mw:WikiLink" title="Paul Zweifel">Paul Zweifel</a></b> became the first to demonstrate that the <a href="./Fetus" id="mwBl8" rel="mw:WikiLink" title="Fetus">fetus</a> <i id="mwBmA">in utero</i> consumes <a href="./Oxygen" id="mwBmE" rel="mw:WikiLink" title="Oxygen">oxygen</a>?