A group of tissues in which small blood vessels from the mother and offspring intertwine but do not join is the:

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Quizplus · Accepted Answer

The description matches the placenta, which is the organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply, without direct mixing of blood between the two individuals. The amnion is a membrane that encloses the embryo and produces amniotic fluid. The embryo is the early stage of development after fertilization. The umbilical cord is a flexible cord that contains blood vessels and connects the developing embryo/fetus to the placenta.

A Group of Tissues in Which Small Blood Vessels from the Mother