Jake has difficuly seeing nearby objects, but can see distant objects clearly. What condition does Jake's doctor diagnose him with?

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Kelly is 33 weeks pregnant and her doctor has scheduled her for a procedure to remove a small amount of fluid to check for the health of the fetus. the procedure is called .

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.