The epithelium of the retina and the thyroid gland is composed of which type of cells?

Choose the correct sentences for compound epithelium:
$(I)$ Compound epithelium is made of multi-layered cells.
$(II)$ It has a limited role in secretion and absorption.
$(III)$ It provides protection against chemical and mechanical stresses.
$(IV)$ It is present in $PCT$.

The ciliated epithelium in our body may be found in

Identify the location of columnar epithelial tissue.

The lining of body cavities,ducts,and tubes is made up of $.....$.

Tissue is defined as: