I will summarise the main projects we are currently working on that use the chemical abundances and pattern as fossil records of galaxy evolution. In particular, the chemical abundances of the star-forming regions of galaxies contain valuable information about their assembly histories, as well as about the processes that regulate the history of star formation and the mixing of chemical elements. In particular, they encode the history of recent mergers and strong gas inflows, as well as the impact of SN and AGN feedback that could trigger these events. This project was carried out using simulated galaxies from the CIELO and EAGLE projects. I will focus on the studying the impact on the metallicity gradients in the discs and the mass-metallicity relation.