Question

which layers of the atmosphere were most influenced by the transition from atmosphere iii to the modern atmosphere?
troposphere and stratosphere
troposphere and thermosphere
thermosphere and stratosphere
mesosphere and troposphere

Explanation:

Atmosphere III had less oxygen. With the transition to the modern atmosphere (higher oxygen levels), the troposphere (where weather and life - related processes occur, affected by oxygen for respiration etc.) and stratosphere (where the ozone layer forms from oxygen, protecting life) are most influenced.

Answer:

troposphere and stratosphere