Heterotrophs feed on the complex [[1]] molecules prepared by autotrophs. 

Heterotrophs feed on the complex organic molecules prepared by autotrophs. 

A heterotroph is an organism that eats other plants or animals for energy and nutrients. 

Heterotrophs cannot make their own food, so they must eat or absorb it. They feed on the complex organic molecules prepared by autotrophs. 

Autotrophs produce organic molecules such as glucose, through the process of photosynthesis, using basic energy sources like sunlight, water, and carbon dioxide. Heterotrophs then consume these organic molecules to obtain the energy and nutrients they need to survive.

Examples of organic molecules that heterotrophs feed on include carbohydrates, proteins, and lipids, which are broken down into smaller molecules during digestion and then used by the organism for energy, growth, and other metabolic processes.