Question

why do we need to breathe out carbon dioxide​

Answer 1

Explanation:

Everyday functions of the body like digesting your food, moving your muscles or even just thinking, need oxygen. When these processes happen, a gas called carbon dioxide is produced as a waste product. The job of your lungs is to provide your body with oxygen and to get rid of the waste gas, carbon dioxide.

Answer 2

Answer:

As we take in oxygen

it combine with hemoeglobin and travels

through our body

and comes out as co2

i think this is how it works

additional knowlegde-

and co2 is taken by plants for photosynthesis