Concept:Producers are organisms that capture light energy from the Sun and convert it into chemical energy through photosynthesis.
Explanation:In an ecosystem, organisms are classified by how they obtain energy.
Producers, such as green plants and algae, contain chlorophyll.
Chlorophyll absorbs sunlight and uses it to combine carbon dioxide and water.
This process produces glucose, which stores chemical energy in its bonds.
Consumers obtain energy by eating other organisms.
Carnivores feed on animals, and decomposers break down dead matter.
None of these groups can directly change light energy into stored chemical energy.
Only the producer performs this vital energy conversion for the entire ecosystem.
Answer:Producer.