Level in a food chain or web that consists of green plants and a few other organisms (such as green algae) that capture energy from the sun and then introduce the energy into the food chain by incorporating it into organic compounds, which the producers synthesize from water and inorganic substances through the process of photosynthesis. Found on https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter