Chapter 25 Slides Sections 1-3
Chapter 25 Slides Sections 1-3
Chapter 25 Slides Sections 1-3
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Conditions on early Earth<br />
AP Biology<br />
• Reducing atmosphere<br />
water vapor (H 2 O), CO 2 , N 2 , NO x , H 2 , NH 3 ,<br />
CH 4 , H 2 S<br />
lots of available H & its electron<br />
no free oxygen<br />
• Energy source<br />
lightning, UV radiation,<br />
volcanic<br />
What’s missing<br />
from that<br />
atmosphere?<br />
low O 2 =<br />
organic molecules<br />
do not breakdown<br />
as quickly
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