Question

what makes up the earths atmosphere?
a layer of gases that encircles our planet
tiny organisms that fly through the air
air created by humans to survive

Explanation:

The Earth's atmosphere is a layer of gases surrounding the planet. It is not made up of tiny flying organisms (which are just a small part of what's in the air, not the main component of the atmosphere) or air created solely by humans (the atmosphere existed long before humans and has a natural composition).

Answer:

a layer of gases that encircles our planet