Final answer:
AIDS is caused by a virus, histoplasmosis is caused by a fungus, and amoebic dysentery is caused by a protist.
Step-by-step explanation:
AIDS: caused by the human immunodeficiency virus (HIV), which is a virus.
Histoplasmosis: caused by the fungus Historically capsulata.
Amoebic dysentery: caused by the protist Entamoeba histolytica.
Learn more about communicable diseases and pathogens