Final answer:
The placenta is an endocrine structure that appears during pregnancy, secreting essential hormones and facilitating nutrient transfer between the mother and fetus.
Explanation:
The placenta is an endocrine structure that appears during pregnancy, which is true. It secretes hormones such as estrogen, human chorionic gonadotropin, and progesterone, vital for maintaining a pregnancy. The placenta functions as a conduit for nutrient transfer between the mother and fetus, playing a crucial role in fetal development.
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