Which of the following contributes to the difficulty in establishing the etiology of cancer?

Question

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All the options listed contribute to the complexity of understanding cancer's causes. Cancers are not typically contagious, making it hard to trace their origins through infection patterns. Viruses, which are implicated in some cancers, are challenging to study due to their small size and complex interactions with host cells. Most viruses do not cause cancer, making it difficult to identify which ones are carcinogenic. Additionally, the latency period between viral infection and cancer development can span years or decades, complicating the identification of causative agents.

Which of the Following Contributes to the Difficulty in Establishing