Explanation
$$\textbf{Solution a: }$$
$$\bullet$$The tissue found at the outer layer of the skin is Epithelial tissue.
$$\bullet$$Epithelial tissue is the thin, protective, and continuous sheet of cells.
$$\bullet$$It covers the surface of the body such as the outermost layer of the skin.
$$\bullet$$It also covers the inner lining of various body cavities and internal organs such as the mouth, nose, lungs and blood vessels, etc.
$$\bullet$$The cells along with the epithelial cells are merkel cells, keratinocytes, melanocytes and Langerhans cells.
$$\textbf{Solution b: }$$
$$\bullet$$The cuboidal epithelium is also found in some glandular ducts such as salivary glands, pancreatic ducts, and some parts of the kidney.
$$\bullet$$The Simple cuboidal epithelia are found on the surface of ovaries whereas the cuboidal epithelial cells containing microvilli line the testis.
$$\bullet$$It helps in excretion, absorption, secretion and provides mechanical support.
$$\textbf{Solution c: }$$
$$\bullet$$Astrocytes, oligodendrocytes and ependymal cells are cells present in the organ brain.
$$\bullet$$Ependymal cells are the type of neuronal support cell (neuroglia) cells.
$$\textbf{Solution d: }$$
$$\bullet$$Ciliated columnar epithelium is the form of columnar epithelium bearing cilia which lines the respiratory tracts, kidney tubules, and oviduct.
$$\bullet$$The presence of the cilia in the epithelium allows the rhythmic beating in one direction to move the substance.
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