Li Ming thinks that chlorophyll is a reactant of photosynthesis, but her classmate Julian disagrees. Who is correct, and why?
Li Ming is correct because chlorophyll is a substance that is present before the chemical reaction of photosynthesis takes place.
Li Ming is correct because chlorophyll is a substance that is formed from the chemical reaction of photosynthesis.
Julian is correct because chlorophyll is a product, not a reactant, of photosynthesis.
Julian is correct because chlorophyll is neither used up nor formed in the chemical reaction of photosynthesis.