| A) | Leonard Hayflick's theory that the maximum number of times that human cells can divide is about 75 to 80.
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| B) | The theory that aging in the body's hormonal system can lower resilience in the face of stress and increase the likelihood of disease.
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| C) | The thickening of the lens of the eye, which causes vision to become cloudy, opaque, and distorted.
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| D) | Deterioration of the retina in an area that corresponds to the focal center of the visual field.
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| E) | The generation of new neurons.
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| F) | The number of years that will probably be lived by the average person born in a particular year.
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| G) | Inflammation of the joints that is accompanied by pain, stiffness, and movement problems; especially common in older adults.
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| H) | A microbiological theory of aging that states that people age because normal cellular metabolism produces unstable oxygen molecules. These molecules ricochet around inside cells, damaging DNA and other cellular structures.
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| I) | The upper boundary of life; the maximum number of years for human beings is about 120 to 125 years of age.
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| J) | Damage to the optic nerve because of pressure created by a buildup of fluid in the eye.
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| K) | The theory that aging is caused by the decay of the tiny cellular bodies that supply energy for function, growth, and repair.
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| L) | A chronic condition that results in extensive loss of bone tissue and is the main reason that many older adults walk with a marked stoop. Women are especially vulnerable.
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