Which are the four major groups of human pathogens?
a.viruses, fungi, protists, and toxins
b.protists, insects, bacteria, and viruses
c.bacteria, viruses, fungi, and protists
d.fungi, protists, toxins, and bacteria
a.viruses, fungi, protists, and toxins
b.protists, insects, bacteria, and viruses
c.bacteria, viruses, fungi, and protists
d.fungi, protists, toxins, and bacteria