The fluid-filled sac surrounding the developing human organism is called the

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The fluid-filled sac surrounding the developing human organism is called the amniotic sac. The placenta is an organ that develops in the uterus during pregnancy and allows for the exchange of nutrients, oxygen, and waste products between the mother and fetus. The trophoblast is the outer layer of cells in the blastocyst (the early stage of development after fertilization).

The Fluid-Filled Sac Surrounding the Developing Human Organism Is Called