Which of these choices demonstrates the significance of the troposphere? Select one:

a. It holds the ozone layer, the blanket of air that keeps ultraviolet light out of the lower levels of the atmosphere.

b. It is the layer furthest from earth and gives way to the depths of space.

c. It contains the air we breathe, which is a mix of mostly nitrogen, oxygen and carbon dioxide.

d. It holds some of Earth's satellites, along with the International Space Station.
SCIENCE NOT PHYSICS!!!