Which of the Following Provided the Selective Pressures That Most

question 45

Multiple Choice

Which of the following provided the selective pressures that most directly promoted the evolution of photosynthesis?

• A)the drop in surface UV radiation caused by the formation of the ozone layer
• B)the depletion of dissolved organic material from the oceans
• C)the ability of some organisms to use oxygen to generate ATP during respiration
• D)an increase in visible light intensity at the surface of the Earth, caused by solar flares
• E)an increase in volcanic activity and release of CO₂ into the atmosphere