How does the greenhouse effect enable life on Earth?
A:It allows the atmosphere to retain heat.
B:It keeps out the sun’s harmful UV radiation.
C:It controls the amount of carbon dioxide in the atmosphere.
D:It keeps the atmosphere thick.
A:It allows the atmosphere to retain heat.
B:It keeps out the sun’s harmful UV radiation.
C:It controls the amount of carbon dioxide in the atmosphere.
D:It keeps the atmosphere thick.