On Early Earth,more Than 4 Billion Years Ago,environmental Conditions Were

question 36

Multiple Choice

On early Earth,more than 4 billion years ago,environmental conditions were very different from those today because

• A)only early Earth was intensely bombarded by large rocks and ice from space.
• B)only early Earth had an oxidizing atmosphere.
• C)less ultraviolet radiation penetrated early Earth's atmosphere.
• D)early Earth's atmosphere had significant quantities of ozone.

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