What do cells performing similar functions form similar functions when they group together?

Desmosomes are involved in:

The cellular layers in the epidermis of the skin consist of:

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 $PCT$.

Which tissue evolved first in animals?

Identify the location and function of the following tissues:
$(i)$ Ciliated Epithelium
$(ii)$ Stratified Epithelium