[Answered]: The development of a number of tissues, including…

The development of a number of tissues, including the nervous system, is regulated by levels of steroid hormones in the embryonic circulation. Why arent embryos (mammalian embryos) affected by maternal estrogen level during pregnancy?Group of answer choicesMaternal estrogen is kept low in pregnancy.Aromatase in the embryo keeps estrogen levels low.The blood-placenta barrier prevents maternal estrogen accessing the embryo.Plasma proteins in the fetal circulation sequester maternal estrogen.