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The most plausible evidence that the development of cancer is a multistep process can be:
A) development of a cancer as a result of activation of a single oncogene by any of a variety of mechanisms
B) usual occurrence of retinoblastoma at a young age
C) fact that proto-oncogenes are widely conserved in evolution
D) observation that certain tumor-suppressor genes and oncogenes are involved in a sequential manner in the development of colon cancer
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The most plausible evidence that the development of cancer is a multistep process can be:
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