Answer:
B
Explanation:
analysis of the system affects the environment on which you are sudying
<u>Answer:
</u>
The build-up of three oxygen created our ozone layer around two billion years ago.
<u>Explanation:
</u>
- The ozone layer is a part of the stratosphere which is located right after the troposphere in the atmosphere of the Earth.
- The ozone gas is made up of the abundance of three oxygen molecules combining with the ultraviolet radiation emitted by the Sun.
- The development of the ozone layer happened around two billion years ago when the oxygen concentration levels on the planet began to rise slowly and gradually.
Chile, Argentina, Brazil, Paraguay
<span>The Rocky Mountains extend from Alaska to New Mexico </span>
Passing legislation because that is high levels
