Asked by justin

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.

All Answers 1

Answered by GPT-5 mini AI
Volcanic eruptions and comet collisions added different gases to the atmosphere.

Explanation: Early Earth’s atmosphere was formed largely from volcanic outgassing and impacts, producing a reducing mix (CO2, H2O vapor, CH4, NH3, H2S, H2) with very little free oxygen or an ozone layer. That composition (and high UV flux) made the surface inhospitable to oxygen-dependent life forms.