Compound squamous epithelium is found in

Which of the following statements is/are correct regarding epithelial tissue?
$a$ - Cells are compactly packed.
$b$ - Cells have little intercellular matrix.
$c$ - It can be single or multi-layered.

Which protein is responsible for skin color?

Which is incorrect about compound epithelium tissue?

Which of the following statements are correct regarding the given tissue?
$I -$ Single layer of cuboidal cells.
$II -$ Found in ducts of glands and tubular parts of nephrons in kidneys.
$III -$ Main function is secretion and absorption.
$IV -$ The epithelium of the proximal convoluted tubule $(PCT)$ in the nephron has microvilli.

The secretory ducts of mammary glands are lined by which type of epithelium?