Question

in the process of photosynthesis, what is combined with carbon dioxide to produce glucose? water nitrogen phosphorus

Explanation:

In photosynthesis, plants use light energy to combine carbon dioxide ($CO_2$) and water ($H_2O$) to produce glucose ($C_6H_{12}O_6$) and oxygen ($O_2$). The overall chemical equation is $6CO_2 + 6H_2O \xrightarrow{light} C_6H_{12}O_6+6O_2$. Nitrogen and phosphorus are not reactants in the basic photosynthesis reaction for glucose production.

Answer:

water