A) Their immune systems have degenerated
B) The supply of certain hormones declines with age
C) Their bodies are unable to adjust to the changing environment
D) They have accumulated more mutations
Correct Answer: A
Solution :[a] As we age, our immune system weakens, making us even news vulnerable to disease. That's why diseases like cancer become more common as we age?they grow because we have decreased surveillance (and decreased protection) in our bodies. Cancers are age-related, much more frequent in the old than in the young. A University of Colorado Cancer Centre review published in 2012 in the journal Oncogene argues against the conventional wisdom that the accumulation of cancer-causing mutations leads to more cancer in older people, instead positing that it is the changing features of tissue in old age that promote higher cancer rates in the elderly.
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