What vital role does the dispersal of heavier elements from the SNR play?

Cosmic recycling, making elements available for incorporation into future stars and planets.

The material ejected by a supernova, which comprises the bulk of the expanding remnant, is crucial for the chemical evolution of the universe. During the star's life and the supernova event itself, nucleosynthesis creates elements heavier than hydrogen and helium. When the SNR eventually dissipates into the interstellar medium, it effectively enriches that medium with these newly forged heavier elements. This process of cosmic recycling ensures that subsequent generations of stars and the planetary systems that form around them contain the necessary building blocks for rocky planets and complex chemistry.