(B) The blastula of a frog is characterized by a central fluid-filled cavity called the blastocoel. Because the blastula is a hollow sphere of cells,i

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(B) The blastula of a frog is characterized by a central fluid-filled cavity called the blastocoel. Because the blastula is a hollow sphere of cells,it is classified as a $Coeloblastula$. An $Amphiblastula$ is found in sponges,while a $Stereoblastula$ is a solid blastula found in some other organisms.