PATHOLOGY

Detailed explanation-1: -Only during photosynthesis, plants take in carbon dioxide and release oxygen as a byproduct.

Detailed explanation-2: -A molecule of carbon dioxide (CO2) is made up of one carbon atom and two oxygen atoms.

Detailed explanation-3: -Yes, it is true that animals breathe oxygen and give out carbon dioxide; this is done in the process of respiration. When we inhale or breathe in, we pull air mainly containing nitrogen and oxygen into our lungs, and whenever we exhale or breathe out, we mostly release carbon dioxide.

Detailed explanation-4: -Cellular respiration is a chemical process in which food molecules are broken down into simpler molecules within the cells and energy is produced. In cellular respiration, the inhaled oxygen is used for breaking the food. Hence in respiration oxygen is required and carbon dioxide is released out.