Answer:
producers
Step-by-step explanation:
The first level includes the producers—the photosynthetic plants—which convert the Sun's radiant energy into nutrients available to other organisms in the community. These plants are eaten by herbivores (plant-eaters, or primary consumers), the second trophic level.
The first trophic level in every ecosystem is autotroph.
WHAT IS TROPHIC LEVEL:
Trophic level is the position of an organism in the flow of energy within an ecosystem.
In an ecosystem, energy flow begins with a set of organisms called producers or autotrophs. Examples of autotrophs are green plants, algae etc.
Therefore, the first trophic level in every ecosystem is autotroph.