Question

Why do we breathe out carbon dioxide​

Answer 1

When we take a breath, we pull air into our lungs that contains mostly nitrogen and oxygen. When we exhale, we breathe out mostly carbon dioxide. ... Oxygen helps our cells work harder by breaking down the nutrients we get from food like sugars. With sugars and oxygen, our cells can create the energy they need to function.

Answer 2

Answer:

We breathe out CO2 because it is harmful for our health and it is the gas which is needed and required by the plants to make the process of photosynthesis due to which we are able to eat food and inhale our O2 gas