Question

(01.03 lc)
what do theories hypothesize about the conditions of earths early atmosphere?
little to no oxygen
low levels of ultraviolet radiation
protective atmosphere
very cold temperatures
question 2 (4 points)
(01.03 lc)
what conditions are needed to form organic molecules from inorganic molecules?
abundance of oxygen and the ozone layer
active volcanoes and very cold temperatures
presence of inorganic molecules with lightning and intense radiation
low levels of ultraviolet radiation and a specific mixture of gases

Explanation:

For the first question:

• The early Earth's atmosphere had little to no oxygen. This is supported by scientific theories. There was no ozone layer (which is made of oxygen) to block ultraviolet radiation, so there were high levels of ultraviolet radiation, not low. It was not a protective atmosphere as we know now. And it was not very cold; in fact, volcanic activity made it hot.

For the second question:

• Organic molecules formed from inorganic molecules needed the presence of inorganic molecules along with energy sources like lightning and intense radiation (as in the Miller - Urey experiment). Abundance of oxygen (and thus the ozone layer) would prevent the formation as oxygen is a reactive gas that can break down organic compounds. Active volcanoes were present but very cold temperatures are not correct. Low levels of ultraviolet radiation are incorrect as ultraviolet radiation was a source of energy for the reactions.

Answer:

1. a. Little to no oxygen
2. c. Presence of inorganic molecules with lightning and intense radiation