I need help on a few science questions?

Question

How much faster than sound do electromagnetic waves (like light) travel? Describe carbon dioxide and how it is formed. How is it harmful? Describe carbon dioxide and how it is formed. How is it harmful?

Answer 1

I think sound travels at a speed of 34.3 meters per second, and the speed of all electromagnetic waves are 300 thousand kilometers per second.

Who said that carbon dioxide is harmfull? Carbon di is not harm full but we die in presence of too much carbon di coz there ll be no supply of oxygen to us. This happens also when there is any other harmless gas instead of carbon di.