Find the integral. 
Definitions:
Placenta
The principal organ of exchange between the mother and the developing organism, enabling the exchange of nutrients, oxygen, and wastes via the umbilical cord.
Amnion
A membrane that holds amniotic fluid.
Umbilicus
also known as the navel or belly button, is the scar on the abdomen resulting from the detachment of the umbilical cord following birth.
Mesoderm
The middle layer of an embryo in early development, between the endoderm and ectoderm, which develops into muscles, bones, and circulatory systems.
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