what does einstein's famous equation for nuclear energy, e = mc², mean?

the answer is a for sure mark brainliest i had got this right on usatestprep

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.