The answer is B. Polynesia I hope I'm not too late or if I am I could aide those who need this answer. :)
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I think its B, not fully sure
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The build-up of three oxygen created our ozone layer around two billion years ago.
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- 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.
The earliest of civilizations were based around river valleys. This allowed them to irrigate fresh water to their crops allowing for better farming and therefore, bigger and better civilizations.
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What are the following answers
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