Answer;
-Producers
Explanation;
-An ecological niche is the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces.
-Autotrophs always occupy the lowest level of ecological pyramids. They serve as a primary producer in a food chain They are the link between the sun's energy and the organisms that cannot manufacture their own food. Without an abundant amount of autotrophs we would be severely lacking in atmospheric oxygen and food.