The total number of electrons flowing through an electric device delivering a current of 15.0 A for 30 seconds is approximately 2.81 x 10^21. This is calculated by first finding the total charge in coulombs and then converting that charge into the number of electrons. Each electron has a charge of about 1.6 x 10^-19 C.
;
The statement about the pituitary gland being controlled by sex hormones is True, as sex hormones like estrogen and testosterone influence its hormone release. The pituitary gland's function is closely linked to a feedback loop with the hypothalamus and gonadal hormones. This regulatory process is essential for reproductive health. ;