An organism at the start of a food chain which provides the total input energy into an ecosystem is the? By: Sunday|Published on: Nov 18|Categories: Biology WAEC| 0 comments A. sun B. producer C. consumer D. decomposer Correct Answer: Option B B. producer Users Also Read These:The progressive loss of energy at each level in a…The continuity of an ecosystem depends on constant…The organism designated P in the food chain above is…In an ecosystem, the organism which changes light…During the manufacture of food by plants, which of…SEE ALSO The increase in width of blood vessels in the mammalian skin at high temperatures is known as?