Autotrophs take in  salty raw  materials and prepare complex food.

Autotrophs take in complex raw  materials and prepare simple food.

Autotrophs take in organic raw  materials and prepare inorganic food.

Autotrophs take in inorganic raw  materials and prepare organic food.

Digestion converts carbohydrates, proteins and lipids to starch, amino acids and fatty acids  respectively.

Digestion converts carbohydrates, proteins and lipids to glucose, amino acids , fatty acids and glycerol respectively.

Digestion converts carbohydrates, proteins and lipids to glucose, amino acids and fats respectively.

Digestion converts carbohydrates, proteins and lipids to glycogen, fat and glycerol respectively.