A: More prominent lymphoid nodules forming germinal centers, mucosal glands are shallower and less abundant.

A: Goblet cells and columnar absorptive cells [view image], with many more goblet than columnar cells. The colon's job is to lubricate feces, facilitating transport of feces to the rectum (hence abundant mucus-secreting goblet cells), and to reabsorb water and salt from feces (hence presence of absorptive cells.)