2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2641Some aspects of the chemical evolution of late-type dwarf galaxies are reviewed, together with their implications on three issues of cosmological relevance: similarity to primeval galaxies, derivation of the primordial helium abundance, contribution to the excess of faint blue galaxies. A more detailed approach to model their evolution is suggested. The importance of deriving the star formation history in these systems by studying their resolved stellar populations is emphasized.8 pages, 6 encapsulated figs. Review paper to appear in 'Dwarf Galaxies and their Environment", K.S. de Boer, R.J. Dettmar, U. Klein eds (Shaker Verlag, De), 2001 in pressAstrophysicstext