The fluid-filled cavity separating the inner cell mass from the trophoblast is the

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The blastocoele is the fluid-filled cavity that separates the inner cell mass from the trophoblast in the early stages of embryonic development. Choice B, amniotic cavity, forms later in development and is a fluid-filled sac that surrounds and protects the developing embryo. Choice C, lacuna, refers to small spaces or gaps within tissues and is not specific to embryonic development. Choices D and E, epiblast and hypoblast, refer to specific layers of cells within the developing embryo and are not specific to the fluid-filled cavity separating the inner cell mass from the trophoblast.

The Fluid-Filled Cavity Separating the Inner Cell Mass from the Trophoblast