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faltersainse [42]
4 years ago
14

The primitive streak appears during

Medicine
1 answer:
solniwko [45]4 years ago
5 0

Answer:

Gastrulation.

Explanation:

The embryonic development occurs through the different developmental stages like cleavage, morula, blastula and so on. The formation of the germ layers occur in the gastrulation period.

The primitive streak is the structure that develops during the early stages of the gastrulation. As the embryo becomes asymmetric., the cells moves from their initial position and leads to the formation of primitive streak in the gastrulation phase.

Thus, the correct answer is option (C).

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Explanation:

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Placenta also participate as an endocrine organ (releasing HCG, Progesterone, Estrogen, human placental lactogen) and an immunity organ (allowing IgG antibodies to pass through).

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I hope this answer is correct

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