The letter indicating the integument layer is A.
What are squamous cells?
Squamous cells has been described as thin, flat cells that look like fish scales, and are found in the tissue that forms the surface of the skin, the lining of the hollow organs of the body, and the lining of the respiratory and digestive tracts.
Squamous cells usually have protective functions in the epithelial tissue layers where they are found. They protect the layer of cells below from microorganisms invasion as well as prevent water loss.
Squamous cells also play important roles ingaseous exchange in the lungs and waste and nutrients exchange in the digestive tract.
From the diagram given in your question, the letter indicating the integument layer is letter A.
Squamous cells look like fish scales when see under a microscopic eye.
In conclusion, Squamous cells are flat cells and are found in the epidermis. The Squamous cells shed as new ones form.
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