AP BIOLOGY

Detailed explanation-1: -Cellular respiration however, uses oxygen and glucose to create ATP, carbon dioxide and water. Cellular respiration does not depend on sunlight and so it can occur at all times of day. Cellular respiration occurs the most when plants need energy, since it produces ATP.

Detailed explanation-2: -Abstract. The origin of oxygenic photosynthesis in Cyanobacteria led to the rise of oxygen on Earth  2.3 billion years ago, profoundly altering the course of evolution by facilitating the development of aerobic respiration and complex multicellular life.

Detailed explanation-3: -It releases oxygen as a byproduct. Respiration is essentially the reverse of photosynthesis. Respiration occurs constantly, 24/7, in all plant cells. It uses oxygen to break down the stored complex carbohydrates into simple carbohydrates.

Detailed explanation-4: -The purpose of cellular respiration is simple: it provides cells with the energy they need to function. If living things could not get the energy they need out of food, it would be absolutely worthless. All living things would eventually die, no matter the quality and amount of food.