It's not like your heart cells and kidney cells get all mixed up every day, and that's because there's all of this chemistry going on, these molecules that say who each of these groups of cells is and what their tasks should be.
Sel-sel jantung dan sel-sel buah pinggang anda  tidak bergabung setiap hari, ia kerana semua proses kimia ini  terus berlaku; molekul ini dapat membezakan sel-sel di dalam kumpulan sel itu, dan apakah tugasnya.