Which of the following best describes a change in Earth's atmosphere made by early photosynthetic life?
increased level of oxygen increased level of carbon dioxide decreased ability to support life decreased ability to transmit light
Question: Which of the following best describes a change in Earth's atmosphere made by early photosynthetic life?
A. increased level of oxygen
B. increased level of carbon dioxide
C. decreased ability to support life
D. decreased ability to transmit light
Answer: