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We discuss how knowledge of the whole evolutionary history of dwarf galaxies,including details on the early star formation events, can provide insight onthe origin of the different dwarf galaxy types. We suggest that these types maybe imprinted by the early conditions of formation rather than being only theresult of a recent morphological transformation driven by environmentaleffects. We present precise star formation histories of a sample of Local Groupdwarf galaxies, derived from colour-magnitude diagrams reaching the oldestmain-sequence turnoffs. We argue that these galaxies can be assigned to twobasic types: fast dwarfs that started their evolution with a dominant and shortstar formation event, and slow dwarfs that formed a small fraction of theirstars early and have continued forming stars until the present time (oralmost). These two different evolutionary paths do not map directly onto thepresent-day morphology (dwarf spheroidal vs dwarf irregular). Slow and fastdwarfs also differ in their inferred past location relative to the Milky Wayand/or M31, which hints that slow dwarfs were generally assembled in lowerdensity environments than fast dwarfs. We propose that the distinction betweena fast and slow dwarf galaxy reflects primarily the characteristic density ofthe environment where they form. At a later stage, interaction with a largehost galaxy may play a role in the final gas removal and ultimate terminationof star formation.

The ACS LCID Project: On the origin of dwarf galaxy types: a manifestation of the halo assembly bias?