The early atmosphere of Earth had more methane and ammonia than what is present today. Where did these gases go?
A. Methane and ammonia dissolved in Earth's oceans.
B. Sunlight broke methane and ammonia apart and the hydrogen escaped to space.
C. Plant life converted methane and ammonia to nitrogen and carbon through photosynthesis.
D. Cometary and planetesimal impacts provided enough energy for these gases to escape to space.
Answer: B
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