Which organism has been important in studying cell differentiation due to its unique life cycle encompassing both single-celled and multicellular life stages? Select one: a. Naegleria fomleri b. Acanthamoeba c. Entamoeba histolytica d. Dictyostellum discoideum Which organism has been important in studying cell differentiation due to its unique life cycle encompassing both single-celled and multicellular life stages? Select one: a. Naegleria fomleri b. Acanthamoeba c. Entamoeba histolytica d. Dictyostellum discoideum