Weakness in what muscle can lead to chronic back pain?

weakness of core muscle can lead to chronic back pain

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.