Question

3 select the correct answer from the drop - down menu. planet x is a terrestrial planet in our solar system. it has 21% oxygen in its atmosphere. humans can walk on this planet without the aid of a space suit. based on the description, planet x is

Explanation:

Earth is a terrestrial planet with about 21% oxygen in its atmosphere and is habitable for humans to walk on without a space - suit. Mars has a thin atmosphere with very little oxygen, Mercury has a negligible atmosphere, and Venus has a thick, toxic atmosphere.

Answer:

Earth