Trophic levels refer to the different levels in a food chain or food web where organisms obtain energy. Each level represents a different position in the transfer of energy, with producers at the bottom and top predators at the highest level.
Autotrophs are organisms that can produce their own food using sunlight or chemical reactions as an energy source.
Producers: Producers are autotrophic organisms, such as plants, algae, and some bacteria, that convert sunlight into chemical energy through photosynthesis.