During the embryonic stage, a hollow ball of cells is known as a:

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During the embryonic stage, a hollow ball of cells is known as a blastula. A morula is a solid ball of cells that forms early on in embryonic development, before the blastula stage. A gastrula is a stage later in development when the blastula folds in on itself to form different layers of cells. A larva is a distinct life stage that may occur after embryo development is complete, and a blastopore is the opening in the blastula that can give rise to the digestive system in some animals.

During the Embryonic Stage, a Hollow Ball of Cells Is