33. The expression "an army" in line 6 is closest in meaning to
(A) an illness
(B) an attack
(C) a large number
(D) a distinct type
34. The expression "an army in line 6 is closest in meaning to
(A) an illness
(B) an attack
(C) a large number
(D) a distinct type
35. According to the passage, some organisms produce antibiotics in order to
(A) prevent disease in humans
(B) aid digestion
(C) fight off other organisms
(D) create new types of nutrients
35.The word "vary" in line 19 is closest in meaning to
(A) differ
(B) endure
(C) balance
(D) contribute
36. The word "they" in line 23 refers to
(A) sponges, worms and shellfish
(B) vertebrates
(C) individuals
(D) transplants
37. According to the passage, a transplant of tissue between genetically incompatible organisms will result in the transplanted tissue
(A) becoming a parasite
(B) being treated as an invader
(C) altering its genetic makeup
(D) developing a new immune system
