16. The existence of intestinal stem cells found in the crypts of intestinal villi that can give rise to differentiated

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16. The existence of intestinal stem cells found in the crypts
of intestinal villi that can give rise to differentiated cells was
demonstrated by: a) Intestinal organoids that can be derived from a
single intestinal stem cell b) Nuclei from cells at the tips of the
villi transplated into an enucleated egg c) The observation that
all of the descendants of cells derived from the crypt stay
confined within the crypt for the life of the organism d) Labeled
cells in the crypt give rise to labeled descendent cells that are
found along the length of the villi e) A and D