The diagram shows one of the human embryonic | vedclass

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(D) The diagram represents a blastocyst,which is an early stage of human embryonic development. In this structure,the outer layer of cells is called t

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$A$-Inner mass of cells; $B$-Blastocoel

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(D) The diagram represents a blastocyst,which is an early stage of human embryonic development. In this structure,the outer layer of cells is called the trophoblast. The inner group of cells attached to the trophoblast is known as the inner cell mass (indicated by $A$). The fluid-filled cavity present inside the blastocyst is called the blastocoel (indicated by $B$). Therefore,$A$ represents the inner cell mass and $B$ represents the blastocoel.

The diagram shows one of the human embryonic developmental stages. What do $A$ and $B$ indicate?

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