Question

which is required for the light - dependent reactions in photosynthesis to occur?
h₂o
atp
nadph
co₂

Explanation:

In the light - dependent reactions of photosynthesis, water ($H_2O$) is split. ATP and NADPH are products of these reactions, and $CO_2$ is used in the light - independent reactions.

Answer:

A. $H_2O$