AP BIOLOGY

Detailed explanation-1: -Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide.

Detailed explanation-2: -While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration. We breathe in that oxygen, which is carried through our blood to all our cells.

Detailed explanation-3: -Cellular respiration takes place in the cells of animals, plants, and fungi, and also in algae and other protists. It is often called aerobic respiration because the process requires oxygen (the root aer comes from the Greek word for “air”).

Detailed explanation-4: -The first product made during cellular respiration is a gas called carbon dioxide. This gas is released from the body when we breathe out.