Here's why:

* Autotrophs are organisms that produce their own food through processes like photosynthesis (using sunlight) or chemosynthesis (using chemicals). They are the base of the food chain.

* Trophic levels describe the feeding relationships in an ecosystem. The first trophic level is the level of producers, which are autotrophs.

Examples of autotrophs include:

* Plants

* Algae

* Some bacteria