Question

Why do we need to breathe out carbon dioxide

Answer 1

we need to breath out carbon dioxide as we taken in air which is a mixture of different gases and we only need oxygen so with carbon dioxide rest of the gases except oxygen are released .

Answer 2

Answer:

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.