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Read the following excerpt and answer the questions asked at the end. The answer to the questions should be based on the excerpt. 
When there is a conflict between cells and the body they reside in, natural selection usually favours the body, which can usually discipline the errant cells, especially because the cells don’t have a life of their own outside the body. A well-known exception to this principle is that of cancer cells, which can be thought of as selfish cells attempting to reproduce faster than is good for the health of the whole body. In the end, of course, the cancer cells perish with the individual, but that does not explain why natural selection has not eliminated cancer all together. A common objection to the interpretation of cancer cells as selfish is that they are abnormal and perhaps infected with a virus that cancer is a disease, and so on. All this is true and pertinent to the proximate answer to the question of why cancer cells reproduce faster than is good for the body. But the altimate, evolutionary answer must be that natural selection in this case is acting in favour of the cell rather than the individual.

In case of cancer cells is an exception to the usual norm, namely, that

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EXPLANATION

In case of cancer cells is an exception to the usual norm according to which ...

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