Final answer:
Senescence refers to the period when aging changes become apparent, hinting at an irreversible cellular state of dormancy, leading to reduced cell division and regenerative capabilities. The correct option of choice is C) Aging changes become apparent.
Step-by-step explanation:
Senescence refers to the period when aging changes become apparent. In the context of cells, senescence is an irreversible state of dormancy. Cells not only undergo senescence, but they can also initiate programmed cell death, known as apoptosis, or enter into unregulated cell division which can lead to tumors and cancers.
The aging process on a cellular level includes the shortening of telomeres affecting cell division and ultimately decreasing the cell's ability to regenerate. Changes in cell membranes affect transport efficiency and may contribute to diseases associated with aging.