The (a) intestine, (b) esophagus and (c) stomach are shown. Quiescent stem cells (d) through asymmetric division probably give rise to more rapidly dividing active stem cells, which then produce ...
What's left in the digestive tract passes into the large intestine, where it's eaten by billions of harmless bacteria and mixed with dead cells to form solid feces. Water is reabsorbed into the ...
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