How do heterotrophs differ from autotrophs?

Heterotrophs and autotrophs differ from each other in that organisms of the first group cannot independently synthesize nutrients necessary for life and are forced to receive them in a ready-made form. Basically, heterotrophs eat autotrophs or other heterotrophic organisms, as animals do, or enter into symbiosis with them, as mushrooms do. Autotrophs can independently create all substances necessary for their existence from the chemical elements of soil, water and air.