Primary producers are organisms that acquire their energy from sunlight and materials from nonliving sources. Algae, higher plants, and some bacteria and protists are important autotrophs in running waters. Heterotrophs obtain energy and materials by consuming living or dead organic matter.
they include plants, lichens, and moss, bacteria and algae. They live in and around organic matter. They are not mobile, they live and grow where there are nutrients to sustain them. In a terrestrial ecosystem they are mostly green plants (photosynthetically active)
