GEPI

Scaling relations among stellar mass, specific star-formation rate (SSFR), and metallicity (O/H) provide strong clues for how galaxies evolve through cosmic time. In the Local Universe, SSFR is inversely correlated with stellar mass and O/H. This talk will explore analogous correlations of stellar mass, SSFR, and metallicity from redshift z=0 to z<=3.5 based on a sample of star-forming galaxies with metallicity measurements spanning almost a factor of 100. Results suggest that SSFR and O/H evolve in a way that makes the relations of Mstar, O/H, and SFR redshift invariant, in concordance with predictions of recent theoretical models.