Which best explains a primary reason for the inability of life to exist in Earth’s early atmosphere? There was insufficient energy from material collisions to change their density. High temperatures during Precambrian time caused surface water evaporation. Volcanic eruptions and comet collisions added different gases to the atmosphere. Available oxygen was used to help create an ozone layer within Earth’s atmosphere.

The sentence that best explains the primary reason for the inability of life to exist in Earth’s early atmosphere is " Volcanic eruptions and comet collisions added different gases to the atmosphere".

During the early years of the Earth volcanic eruptions were much more common than they are today. When these volcanoes erupted, they spewed many gases into the atmosphere, including:

Carbon dioxide
Water vapor
Nitrogen
Hydrogen

which was directly responsible for the composition of the early atmosphere.

Due to these gases being released into the atmosphere by Volcanic eruptions, causing a severe lack of oxygen, life on Earth was almost unsustainable. It was not until solar radiation and photosynthesis produced oxygen that life became sustainable.

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