What has raised the percentage of carbon dioxide in exhaled air?

What happens if the percentage of carbon dioxide is increased in the atmosphere?

What is the percentage of oxygen in the exhaled air ?

Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide?

Suppose you have to determine the percentage of carbon dioxide in a sample of a gas avilable in a container. Which is the best absorbed material for the carbon dioxide :