The process of phagocytosis has been fully explored thanks to the sacrifices of sea stars and daphnia At the final stage of research in this field, these very creatures were used. Various foreign organisms were injected into the bodies of daphnia and sea stars. Those daphnia and starfish in which too many foreign organisms were introduced died. Their mobile special cells (that's what scientists called phagocytes at the time) simply did not have time to digest everything👐🏻