The wall that seperates the right side of the heart from the left side is the

Well there are infact 2 walls. There is the atrial septum which separates right and left atriums. And there is the ventricular septum which separates the right and left ventricles. 

I'm not quite sure if if it's asking you for two or one answer, but maybe writing both shall help.

Very minute and important evidence needs to be collected in order together detail and figure out what had happened

Both prokaryotic and eukaryotic cells have ribosomes and cell membranes