Heterotrophs can't directly use inorganic materials to make organic matter, but can only convert the ready-made organic matter ingested from the outside into its own components and store energy.
There are few microorganisms in heterotrophs. It is a microorganism that uses light as energy and organic carbon compounds (formic acid, acetic acid, methanol, isopropanol, etc.) to grow and reproduce. ) as a carbon source and hydrogen donor for photosynthesis. Such as purple non-sulfur bacteria.
Chemotactic heterotrophs includes all animals and most bacteria. It is to use external organic matter as C source and energy to synthesize its own organic matter and store energy.