Question

What has raised the percentage of carbon dioxide in exhaled air .​

Answer 1

Answer:

burning fossil fuels like coal ,oil and gas release co2 carbon dioxide

Answer 2

1. Cells release carbon dioxide into blood and blood brings the deoxygenated blood to lungs .

2. From lungs carbon dioxide is sent out by the process of exhalation .

So , percentage of carbon dioxide in exhaled air is more.