also like animals, most fungi use oxygen to produce energy. (once again, yeasts are an exception-- they are anaerobic fersnenters. Fungi also store carbon as glycogen (not starch, as plants do) Additionally, 80-85 % of their ribasomal RNA, which plays an essential role in protein synthesis, is shared with animals. This is way treating fungal infections in human is difficult. Many drugs that would kill the fungus would also harm our cells. The good news is that humans and other mammals are much less susceptible to parasitic fungi than plants are.