Biology
NULL
Medium
Question
The first stage of development in which a cavity appears is the __________?
A
Neurula
B
Morula
C
Gastrula
D
Blastula
✓ Official correct answer
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A
Neurula
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B
Morula
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C
Gastrula
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D
Blastula
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Explanation
The blastula is the developmental stage at which a fluid-filled cavity, called the blastocoel, first appears within the embryo, following the solid ball-of-cells morula stage.