Which statement describes a similarity between stomach worms and liver flukes? A. Both are usually fatal to the infected animal
B. Both are considered external parasites
C. Both attack the digestive tracts of sheep
D. Both thrive in moist environments

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Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.