The primitive streak first appears in which labeled stage of embryonic diagram?
Correct answer: C. C
- A. A
- B. B
- C. C
- D. D
Explanation
The primitive streak is a key structure that forms during early embryonic development and marks the beginning of gastrulation. Stage C in the diagram represents the point where the inner cell mass begins to differentiate and form the bilaminar disc, which is when the primitive streak first appears as a groove in the epiblast layer.
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