The theories hypothesize about the conditions of Earth's early atmosphere are little to no oxygen. The correct option is A.
What is the atmosphere?
A layer (or layers) of gases that envelop a planet and are held in place by gravity is known as an atmosphere. The atmosphere of a planet is preserved when the gravity is high and the temperature is low.
The atmosphere has five layers. They are exosphere, thermosphere, mesosphere, stratosphere, and lithosphere. Different types of gases and temperatures are present in different layers of the atmosphere.
The former theory says that there was no oxygen present in the atmosphere in old times. That's why there was no life, or there were small creatures present.
Thus, the correct option is A. little to no oxygen.
To learn more about the atmosphere, refer to the below link:
https://brainly.com/question/26767532
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