You observe a tissue that has cells of varying heights. at first glance, it appears that the tissue has multiple cell layers, but upon closer investigation, you see that all of the cells attach to the same basement membrane. what classification would you give to this epithelial tissue?

pseudostratified columnar epithelium

Explanation:

The key to distinguished between pseudostratified columnar epithelium and stratified columnar epithelium is that all of the cells attach to the same basement membrane. Pseudostratified creates the false impression of being a multi-layered tissue but it is in fact made up of only one cell layer. What creates this false impression is the different heights that cells have. This tissue can have cilia or microvilli. Can be found where secretion or mucus is needed.  

that is wrong, its not thymus.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves