The structure within which the placenta normally develops is the part labelled: 4. D.
What is a placenta?
Placenta can be defined as a temporary organ within the female reproductive system that typically joins the developing fetus to the uterine wall of the mother, in order to allow the following activities through her blood supply:
- Uptake of nutrient uptake.
- Elimination of waste materials.
- Gas exchange or respiration.
The organs of the female reproductive system.
Generally, the female reproductive system comprises the following major organs:
- The ovaries
- Uterine tubes
- Vagina
- Accessory glands
- Uterus
In conclusion, the structure within which the placenta normally develops is the part labelled D and it is called uterus.
Read more on uterus here: brainly.com/question/877660