Answer the following question given this paragraph: Figure 42.1 In this compound light micrograph purple-stained neutrophil (upper left) and eosinophil (lower right) are white blood cells that float among red blood cells in this blood smear. Neutrophils provide an early, rapid, and nonspecific defense against invading pathogens. Eosinophils play a variety of roles in the immune response. Red blood cells are about 78 m in diameter, and a neutrophil is about 1012m. (credit: modification of work by Dr. David Csaba). Q: What provides an early, rapid, and nonspecific defense against invading pathogens? A:

OPTIONS:
(I) microorganisms.
(II) toxins.
(III) bacteria.
(IV) neutrophils.
Answer:
(IV)