The locations of molecules a and b at the beginning of the experiment are shown. which statement best describes what was observed when the setup was examined 20 minutes later?
1. molecule a remained inside the artificial cell and molecule b remained outside. 2. only molecule a was found both inside and outside the artificial cell.
3. only molecule b was found both inside and outside the artificial cell.
4. both molecules a and b were found inside and outside the artificial cell.