Final answer:
It is true that individuals can develop cancer with no known risk factors due to inherited mutations or spontaneous errors in DNA replication that cause cancer without external environmental triggers.
Step-by-step explanation:
True or False? Some individuals can develop cancer with no known risk factors. The answer is True. Every individual's risk for cancer is a combination of both genetic and environmental factors. While environmental risk factors do account for a significant portion of cancer cases, there are instances when cancer develops due to genetic mutations that can be either inherited or occur spontaneously without any identified environmental cause. Errors in DNA replication or inherited genetic mutations such as BRCA1 and BRCA2 can be present in an individual without any exposure to known cancer-causing substances or environments. This means that not all cancers are caused by external factors; some are genetic, and not everyone with risk factors will necessarily develop cancer.