Advanced Placement (AP), 02.05.2021 08:00 abbycrabby
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In what ways were conditions on the Earth 3 billion years ago different from those today?
A) The early Earth had water vapor in its atmosphere; today's Earth does not.
B) The early Earth was bombarded by large space debris; today's Earth is not.
C) Only the early Earth had an oxidizing atmosphere; today's Earth does not.
D) There was less ultraviolet radiation penetrating the Earth's early atmosphere than there is today.
E) Earth's early atmosphere had significant quantities of ozone, which does not exist in today's
atmosphere
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