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B
Discoblastula
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C
Stereoblastula
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D
Superficial blastula
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Solution
The correct option is B Stereoblastula stereoblastula is in which the embryo produced by spiral cleavage characterized by the absence of a blastocoel and is found in all mollusks except cephalopods. As the blastocoel is absent it is called as a Solid blastula.