Hydrogen fuel cell powered cars emit ?

It emits some amount of water vapor and hot air

Explanation:

Hydrogen fuel cell-powered cars are new technological cars powered by using pure hydrogen in its fuel tank. They are very efficient in use because they do not release any toxic gases like carbon dioxide into the atmosphere. It does not lead to any type of air pollution. It only emits a small amount of water vapor and hot air. These powered cars are god alternate of the cars that run on patrols and diesel but they have certain disadvantages also because hydrogen is a gas that is very flammable and easily catches fire.

d. planting trees

the trees take in carbon to make oxygen.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )