The rock's age is being determined, and is determined hope I helped!
Answer:
Reactants: Carbon dioxide, water, and sunlight
Products: Glucose and oxygen gas
Organisms: Most plants, most algae, and cyanobacteria
What happens?: Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration. Oxygen is also formed.
Phenotype, physical appearance, is determined by the genotype, an organism's genetic makeup.