Which of the following statements is true of the Hadean eon?
A. It marked the ability of single-cell organisms to photosynthesize.
B. The atmosphere was cloudy and much thicker, preventing rapid cooling.
C. The atmosphere consisted of 78 percent nitrogen and no carbon dioxide.
D. It marked the date of the appearance of multicellular life forms.
B. The atmosphere was cloudy and much thicker, preventing rapid cooling.
Explanation: The atmosphere above the Hadean Earth was very different from the atmosphere today. It would have been cloudy and much thicker, thus protecting the ground and preventing rapid cooling. There was no free oxygen, but instead many gases that would be poisonous to life-formstoday.
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What will be an ideal response?