Some scientists think that complex eukaryotic cells formed from the Union of two separate prokaryotic cells. The engulfing or one prokaryotic cell by another is a plausible explanation of why A eukaryotic cells lack the defense mechanisms of prokaryotic cells. B eukaryotic cells don't share any similarities with prokaryotic cells. С organelles in a eukaryotic cell work cooperatively D organelles in a eukaryotic cell would attack other cells. Time Remaining 1 hour 15 minutes​