I need a complete sentence as soon as possible

To perform photosynthesis, violet light is the most important color, and it's from these wavelengths that plants get most of their energy. The reason for this is because out of the visible spectrum, red light is the longest wavelength light that the photosynthesis process can use, but it has the least energy

Explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.