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

D) observation that certain tumor-suppressor genes and oncogenes are involved in a sequential manner in the development of colon cancer

Explanation:

Cancer is defined as the abnormal growth of cells of the body. These cells multiply/replicate without control thereby forming a lump or tumor.

Cancer growth has 5 stages and they go though different multi level steps.Different finding backs this up and it includes observation about certain tumor-suppressor genes and oncogenes being involved in a sequential manner in the development of colon cancer.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

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