Blastula is a single cell layered structure with a cavity inside(Blastocoel) or cell layers of blastomeres. Blastula is end result of cleavage.
Gastrulation is process of formation of trilaminal embryo having 3 fundamental germ layer.
Placenta is an apposition or fusion of extra embryonic membrane with maternal endometrium for the purpose of protection, nutrition and gaseous exchange.
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