Examlex
Multiple pretest and posttest measures are valuable in before-and-after designs because they decrease the possibility of internal invalidity due to ______.
Menopause
The cessation of menstruation, occurring between ages 45 and 55 and signifying the end of reproductive capacity.
Presbyopia
A condition, occurring in the mid- to late 40s, in which the lenses of the eyes no longer accommodate adequately for near vision, and reading glasses or bifocals are required for reading.
Peak Physical Health
The optimum level of bodily functioning, where an individual is at their maximum level of energy, vitality, and physical wellness.
Biological Changes
Alterations in the biological systems of an organism, which can result from genetic, environmental, or developmental factors.
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