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Gastrulation concludes with the disappearance of the blastocoel, marking the beginning of the formation of the three germ layers. Which of the following statements is accurate?

1. Gastrulation concludes with the disappearance of the blastocoel.
2. The formation of three primary germ layers begins at this stage.
3. Both statements above are correct.
4. Neither of the above statements is correct.

Correct answer: Both statements above are correct.

Solution

Gastrulation is a process during embryonic development where the blastocoel is replaced by the archenteron, and the three germ layers (ectoderm, mesoderm, and endoderm) are formed. Both statements (a) and (b) are correct.

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