Multiple choice general knowledge science & technology

Which of these features makes the Earth unique among planets?

  1. It is the only round planet.

  2. It is the only planet with its own moon.

  3. It is the only planet that has enough oxygen in its atmosphere to sustain life.

  4. It is the only ringed planet.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earth's atmosphere contains approximately 21% oxygen, which is essential for most life forms as we know them. Other planets in our solar system have atmospheres composed mainly of carbon dioxide, nitrogen, or lack substantial atmospheres entirely. The presence of liquid water and suitable temperatures along with oxygen makes Earth uniquely habitable.

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