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What gaseous exchange (respiration) occurs in the placenta?

What does the placenta protect the fetus from?

What does the fetus excrete that the placenta takes away?

What nutrients does the placenta help exchange?

What does the placenta transfer?

How is the placenta and chorion formed?

What is the lacuna stage in placenta formation?

What are chorionic villi?

What are the two membranes of the placenta called?

What is polyhydramnios and oligohydramnios?