Final answer:
The half-life of mercury in the human body is not given in the reference provided. The reference example mentions Actinium-225, which has a half-life of 10 days, not mercury.
Step-by-step explanation:
The half-life of a substance is the time required for half of the original amount of the substance to decay or be eliminated from the body. In the case of Actinium-225, as provided in the reference information, its half-life is 10 days. Hence, since the half-life of Actinium-225 is 10 days, and since mercury is not Actinium-225 and does not have the same half-life, the values given in the question (70 days, 65 days, 55 days, 40 days) cannot be correct for the half-life of mercury in the human body as they do not align with the reference provided.