In mammals, the archenteron/primitive gut is lined with
A
Ectoderm
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B
Mesoderm
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C
Endoderm
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D
Mesoderm and endoderm
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Solution
The correct option is C Endoderm The inner cell mass of the blastocyst after implantation differentiates into an outer ectoderm, middle mesoderm and inner endoderm. The primary gut that forms during gastrulation in the developing zygote is known as the archenteron or the digestive tube. It is lined by the endoderm cells.