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Makovka662 [10]
3 years ago
5

What changes were necessary in earth’s atmosphere to allow complex organism to evolve

Physics
2 answers:
jok3333 [9.3K]3 years ago
6 0

Answer:

Earth’s original atmosphere was rich in methane, ammonia, water vapor, and the noble gas neon, but it lacked free oxygen.Oxygen had to become a major atmospheric gas and the ozone layer had to develop.

Zepler [3.9K]3 years ago
5 0
A collision from above such as a meteor and an increase in volcano activity.
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