Our atmosphere is the largest
a. transport and distribution system on earth
b. sphere of earth
c. atmosphere compared to other planets
d. reservoir of liquid water on earth

The answer is A. Our atmosphere is the largest transport and distribution system on Earth.  It is a critical system that regulates climate here on Earth and distribute the heat. It is a very essential part of our planet. Its very existence makes Earth habitable. The atmosphere is a very complex system which contains a lot of physical and chemical reactions to maintain balance on Earth.

Answer// dinosaurs emerged during mesozoic era;