Respuesta :
					                   a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction. 
					                
					                
					             Answer:
So think of it as when to different organisms come and dissolve with each other
Explanation:
When they do what happens we cant see it only under a microscope the organisms become active and when they are that's their reaction to the chemicals. BOOM CHEMICAL REACTIONS
 
			                  