Blastocyst is a modified blastula of

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(A) In mammals,the embryo at the blastula stage is specifically referred to as a $Blastocyst$. This structure consists of an outer layer of cells call

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Placental mammals

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(A) In mammals,the embryo at the blastula stage is specifically referred to as a $Blastocyst$. This structure consists of an outer layer of cells called the $Trophoblast$ and an inner cell mass. Unlike the blastula of amphibians (like frogs),fish,or birds,which typically form a hollow sphere or a disc-like structure $(Blastoderm)$,the mammalian $Blastocyst$ is specialized for implantation into the uterine wall. Therefore,the $Blastocyst$ is the characteristic blastula stage found in placental mammals.

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