Final answer:
Ciliated pseudostratified columnar epithelium is characterized by a single layer of cells with nuclei at different levels and cilia on the surface, and contains goblet cells which secrete mucus.
Step-by-step explanation:
The visible characteristics of ciliated pseudostratified columnar epithelium include a single layer of cells that appear to be stratified due to the arrangement of nuclei at different levels, which gives the appearance of multiple layers. However, this tissue is indeed a simple epithelium since all cells are attached to the basal lamina.
A defining characteristic is the presence of cilia at the apical surface of the cells, aiding in the movement of mucus and trapped particles out of the respiratory tract. Goblet cells, which secrete mucus that traps irritants, are also scattered among these columnar epithelial cells.