Programmed cell death occurs ________________
(a) by means of an intracellular suicide program.
(b) rarely and selectively only during animal development.
(c) only in unhealthy or abnormal cells.
(d) only during embryonic development.
(a) Programmed cell death results from an intracellular suicide program that eliminates unneeded, unwanted, or damaged cells. It occurs frequently and happens even in healthy cells throughout the lifetime of an individual.
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