What is the most important role that carbohydrates play in living organisms on earth?

Carbohydrates are vital for life on Earth and perform a range of functions such as providing energy, structural support and cellular communication. All life on Earth requires carbohydrates. The most important role of carbohydrates is as a source of energy. The chemical energy in sugars is the main source of energy for most living things.

Spherical shaped cell might increase the surface area and decrease the volume.