Answer:
Endometrium
Step-by-step explanation:
Endometrium is the inner layer of the uterus. This layer undergoes changes according to hormonal stimuli and may thicken and shrink throughout the menstrual cycle. It is the structure of a woman's body that is most influenced by hormones to prepare for conception.
At the beginning of the menstrual cycle, the endometrium flakes into menstrual blood or menstruation. After the bleeding ends, the layer begins its thickening process until it reaches its peak and again flakes, ending the menstrual cycle.
It is in this layer that occurs the fixation of the fertilization egg (nesting) and the subsequent development of the placenta and the embryo.