The diagram illustrates a fetus inside the uterus. Which structures are necessary for nourishing the fetus, and which structures are necessary for supporting it and shielding it from mechanical shocks?
- Afeeding: P and Q; supporting and protecting: R and S
- Bfeeding: P and R; supporting and protecting: Q and S
- Cfeeding: Q and S; supporting and protecting: P and R
- Dfeeding: R and S; supporting and protecting: P and Q