A group of nursing students are analyzing the fetal circulation. After the session, the students correctly point out which fetal structure contains the highest concentration of oxygen?

Umbilical vein

Explanation:

Fetal circulation is dependent on the mother's circulation system since the fetal lungs are not adequate to carry out its function. Both oxygen and nutrients are supplied from the mother's blood to the fetus. Umbilical vein is the structure which carries the oxygenated blood from the mother to the fetus. Hence it has the highest concentration of oxygen. Once the blood starts to circulate inside the fetus it keeps becoming devoid of oxygen and nutrients. It is finally returned back to the mother again for oxygenation and supply of nutrients.

probably since the potency of the cocaine, not a lot, but i've never done any research on cocaine so i wouldn't know, but i would also guess it would determine on the gap between sniffs or if you did it all at once, so i really don't know.

smoke some weed

Explanation: