Question

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.

Explanation:

Life - as we know it - requires oxygen for respiration. In Earth's early atmosphere, available oxygen was used to form the ozone layer, leaving little for life - supporting processes. High temperatures causing water evaporation, gas addition from volcanic eruptions and comet collisions, and insufficient energy from material collisions are not the primary reasons for the inability of life to exist compared to the lack of free - oxygen for life forms.

Answer:

Available oxygen was used to help create an ozone layer within Earth’s atmosphere.