In a food web, energy is transferred from one organism to another. As energy moves between the trophic levels, only a small amount of energy is passed to the next level. Most food webs begin with the energy of producers. Producers get their energy from photosynthesis. According to the diagram, what are the products of photosynthesis?
A) glucose
B) glucose and oxygen
C) glucose and carbon dioxide
D) sunlight and carbon dioxide