An organism at the start of a food chain which provides the total input energy into an ecosystem is the? by Sunday | Nov 18 | 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…In an ecosystem the organism which changes light…Interdependence within the ecosystem can best be…Ice of mass 50g at 0°C was completely melted by 70%…In a food chain, each stage in the chain is a?