Question

select the correct answer from the dropdown 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 use of a spacesuit. based on the description, planet x is dropdown with options: earth, mars, mercury, venus
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Explanation:

Earth is the only terrestrial planet in our solar system with ~21% oxygen in its atmosphere, allowing humans to walk without a spacesuit. Mars has thin atmosphere with little oxygen, Mercury has no significant atmosphere, Venus has a thick, toxic atmosphere. So based on the description (terrestrial, 21% oxygen, humans walk without spacesuit), Planet X is Earth.

Answer:

Earth