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The number of d orbitals in the second principal energy level is
Senescence
The biological process of aging, characterized by a gradual decline in the functional capacity of an organism's cells, tissues, and organs.
Diathesis
An inclination or susceptibility toward the development of mental health conditions, shaped by genetic, biological, or external influences.
Homeostatic Adjustment
The process by which living organisms regulate their internal environment to maintain stable, life-sustaining conditions.
Organ Reserve
The excess capacity built into organs, allowing them to cope with extraordinary demands or to compensate for age-related degradation.
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