Pregnenolone is produced from cholesterol and is a precursor to other steroid hormones, including progesterone, estrogen, testosterone, and DHEA. Pregnenolone levels decline with age, and a deficiency can lead to anxiety, mood imbalances, greater perceived stress, and poor cognitive function.
Answer:
A longitudinal study
Explanation:
A longitudinal study can be used to discover relationships between variables that are not related to various background variables. This observational research technique involves studying the same group of individuals over an extended period.
A. Preparation i think I’m sorry if it isn’t right