The second stage of prenatal development begins at about two weeks after conception. at this point, the growing bundle of cells is called an embryo.
In contrast to the stratified squamous epithelium of the skin, the intestinal barrier is composed of a single layer of columnar epithelial cells However, this single layer of intestinal epithelial cells is made of diverse cell types with absorptive, secretory, and immune function
Answer:
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Explanation:
