If photosynthesis had not developed on Earth, living organisms would have led a harsher existence because of
A) a much hotter atmosphere.
B) more intense UV radiation reaching Earth.
C) an overabundance of oxygen in the atmosphere.
D) an inability to obtain energy from inorganic compounds.

Question

Quizplus · Accepted Answer

Photosynthesis is responsible for producing oxygen and creating the ozone layer, which protects Earth from intense UV radiation. Without it, more UV radiation would reach the surface.

If Photosynthesis Had Not Developed on Earth, Living Organisms Would