Multiple choice

The atmosphere of early earth was mainly composed of:

  1. ammonia

  2. methane

  3. hydrogen

  4. oxygen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Early Earth's atmosphere was reducing in nature, composed mainly of hydrogen along with methane, ammonia, and water vapor. Free oxygen only appeared later after photosynthesis began. Options like ammonia and methane were present, but hydrogen is considered the primary component in the primitive reducing atmosphere model.

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