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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____ . a.
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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____ .

a.Earth
b.Mars.
c.Mercury
d.Venus

User Darrin Holst
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Answer: the answer is actually earth

Explanation: A

User Michel Vorwieger
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