Question

Q: define respiration...​

Answer 1

Answer:

a process by which living things produce energy from food. Respiration usually needs oxygen

hope it helps you

Answer 2

Step-by-step explanation:

breathing >short answer

In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction. ... In contrast, exhalation (breathing out) is usually a passive process. > long answer