Hydrogen ions are important in the light-dependent reactions of photosynthesis because they produce a difference in charge across the thylakoid membrane that allows
a. the production of ATP.
b. the release of water molecules.
c. light to enter the chloroplast.
d. the conversion of 3-carbon molecules into higher-energy forms.

a. the production of ATP

Explanation:

Photosynthesis is type of biosynthesis that produces glucose from the reactants sunlight, carbon dioxide and water. It happens in two phases of the chloroplast, the light-dependent and light-independent reactions. In a light reaction that stimulates photosystems, pigments such as chlorophyll absorb light energy at specific wavelengths.  Here,

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?