What process is primarily responsible for transforming a simple hydrogen/helium cloud into a chemically diverse environment?

Answer

Stellar evolution and death

Stellar evolution, particularly the death of stars which enriches the interstellar medium with processed elements, is the process that transforms the initial composition of a gas cloud into a chemically diverse environment.

What process is primarily responsible for transforming a simple hydrogen/helium cloud into a chemically diverse environment?
SpaceastronomycompositionstarsElementsstellar nebula