Identify the gland consisting of isolated glandular cells $:$

Identify the given diagram of tissue performing secretion and absorption.

What is a characteristic feature of simple epithelium?

Cells that perform similar functions group together to form what?

The tissue that has a free surface,which may contain either cilia or microvilli,is:

$A$ student was given a sample of two tissues. He observes the tissues under the microscope and draws their figures ($1$ and $2$) as shown below.