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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
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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

User SynackSA
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4 votes

Answer:

Earth

Step-by-step explanation:

User Reza Ebrahimi
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1 vote
planet Earth is the correct answer.
User Electrobabe
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