These protists live as individual amoebae until starved, at which point they aggregate and form a multicellular fruiting body in which some cells sacrifice themselves to promote the survival of other cells in the fruiting body.
ðiːz pɹˈɑːɾɪsts lˈaɪv æz ˌɪndᵻvˈɪdʒuːəl ɐmˈiːbiː ʌntˈɪl stˈɑːɹvd, æt wˌɪtʃ pˈɔɪnt ðeɪ ˈæɡɹɪɡˌeɪt ænd fˈɔːɹm ɐ mˌʌltɪsˈɛljʊlɚ fɹˈuːɾɪŋ bˈɑːdi ɪnwˌɪtʃ sˌʌm sˈɛlz sˈækɹᵻfˌaɪs ðɛmsˈɛlvz tə pɹəmˈoʊt ðə sɚvˈaɪvəl ʌv ˈʌðɚ sˈɛlz ɪnðə fɹˈuːɾɪŋ bˈɑːdi.