Lista de los principales usos que se le da al gas natural.

An atom's diameter is about 0.1 nanometer (1×10-9m), and a human hair is about 1×10-3m. how many times greater is a human hair than an atom's diameter? sorry pushed wronf button but this is math

In which phase does software coding and testing happen in the spiral model? the spiral model does not have a separate testing phase. both, software coding and testing occurs during the phase.

How would you categorize the software that runs on mobile devices? break down these apps into at least three basic categories and give an example of each.