Question

which of these is a reactant (in) of photosynthesis? oxygen glucose carbon dioxide protein

Explanation:

Photosynthesis is a process in which plants use carbon - dioxide and water, along with sunlight, to produce glucose and oxygen. Carbon dioxide is one of the starting materials (reactants). Oxygen is a product, glucose is also a product, and protein is not involved in the reactants of photosynthesis.

Answer:

Carbon Dioxide