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Gastrulation ______.
a. changes the hollow blastocyst into a hollow embryo that has three tissue layers
b. changes the solid blastocyst into a hollow embryo that has three tissue layers
c. changes a gastrula into a blastocyst
d. changes a hollow embryo into a solid gastrula
e. stimulates labor

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meerkat18
The appropriate response is A. Gastrulation is a stage ahead of schedule in the embryonic improvement of most creatures amid which the single-layered blastula is rearranged into a trilaminate (three-layered) structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm.

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