Examlex
Of the following elements, which has the largest first ionization energy?
Estrogen
A group of steroid hormones responsible for the development and regulation of the female reproductive system and secondary sex characteristics.
Progesterone
Steroid hormone secreted by the corpus luteum and one of the hormones secreted by the placenta.
Ductus Arteriosus
A fetal blood vessel that allows blood to bypass the lungs, which closes soon after birth to establish the regular circulatory path.
Ductus Venosus
A fetal blood vessel that connects the umbilical vein to the inferior vena cava, allowing oxygenated blood from the placenta to bypass the liver and enter the systemic circulation.
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