Identify the correct labeling and its function from the given diagram of a developing fetus.
- A$A$ - Chorionic villi $\rightarrow$ Forms placenta
- B$B$ - Yolk sac $\rightarrow$ Prevents desiccation of embryo
- C$C$ - Umbilical cord $\rightarrow$ Haemopoiesis
- D$D$ - Blastocyst $\rightarrow$ Forms the embryo
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