Describe the flow of energy through an ecosystem from beginning to end.
Hint: Start: Sun

Energy enters the ecosystem via sunlight as solar energy. Primary producers (a.k.a., the first trophic level) turn that solar energy into chemical energy via photosynthesis. Common examples are land plants, photosynthetic bacteria and algae.

Explanation:

Energy flows through an ecosystem in only one direction. Energy is passed from organisms at one trophic level or energy level to organisms in the next trophic level. ... So animals at the second trophic level have only about 10% as much energy available to them as do organisms at the first trophic level.