A)an infection of the human coelom by Ascaris.
B)a large number of Trichinella worms encysting in our muscles.
C)contracting a disease that usually occurs in elephants.
D)microscopic nematodes that reproduce and clog lymph glands,causing infection and limbs to swell.
E)a protozoan that lives in tropical roundworms and which,when ingested by humans,causes muscles to bloat.

A)lacks circular muscles to antagonize the longitudinal muscles and must rely on the rigid cuticle and hydrostatic pressure.
B)extends muscle cells to the nerve process,rather than nerves to the muscle cells.
C)does not utilize the Krebs cycle and electron transport chain in anaerobic parasitic species.
D)moves food through its alimentary tract without direct muscle contractions on the intestine.
E)All of the choices are "unusual" nematode adaptations.

A)Much of the U.S.has bitter cold winters.
B)Most of the population wears shoes.
C)We usually cook our meat and there are few raw meat dishes.
D)We have superior drugs and surgeons.
E)We do not use human excreta ("night soil")to directly fertilize crops.