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  • Biology (Medical Entrance) - 6
  • Which one of the following gases is present today, but wa...
Multiple choice

Which one of the following gases is present today, but was absent about 3.5 billion years ago?

  1. Nitrogen

  2. Hydrogen

  3. Methane

  4. Oxygen

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxygen is present today, but was absent about 3.5 billion years ago.

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