ATP
Explanation:
ATP is produced in the cells and its conversion to energy is a single-step process.
Chlorophyll is the answer I am 100% sure
I'm pretty sure its microwaves
D: interphase
during this phase , the chromosomes undergoes duplication of chromosome of 1 chromatid into chromosome of 2 chromatids , then the cell is ready for the cellular division.
Its definetly not C or D and B sounds ridiculous so its A.