Answer:
Heterotrophs are defined as those organisms that cannot prepare their own food. It is because they cannot carry out the process of photosynthesis. They are depended either directly or indirectly on the producers (autotrophs) as they obtain their food and energy from the autotrophs, in order to survive.
In term of the food chain, the heterotrophs are usually considered as the secondary as well as the tertiary consumers. The heterotrophs include the Herbivores (such as sheep, horse), carnivores (such as lion and tiger) and the omnivores (humans and microbes).