Question

why do we need to breathe out carbon dioxide​

Answer 1

The carbon dioxide breathed out is a by-product of the process of cell respiration, as is water. In this process, energy is produced in the mitochondria of cells.

Our body needs oxygen to obtain energy to fuel all our living processes. Carbon dioxide is a waste product of that process.

Answer 2

$hello \: mate$

Question : Why do we need to breathe out carbon dioxide ?

Answer : Breathing uses chemical and mechanical processes to bring oxygen to every cell of the body and to get rid of carbon dioxide. Our body needs oxygen to obtain energy to fuel all our living processes. Carbon dioxide is a waste product of that process.

I hope my answer helps you.