In multicellular organisms, cells are not like Stentor: they are specialised to carry out specific functions and are often clustered together or in layers. In animals, a layer of ciliated cells forms a ciliated epithelium, which is a tissue.
A tissue is a group of similar, specialised cells in a multicellular organism that carries out a specific function, or several related functions.
Examples of specialised cells:Sperm cells, Red blood cells, Neutrophils, Palisade cells, Root hair cells, Guard cells.
The thin, flat cells that line the alveoli in the lungs form a tissue called squamous epithelium. Other examples of animal tissue are; Cartilage and bone (for support), muscle (for movement), and blood (for transport)
Tissues are grouped into organs. Animals have many organs, such as; lungs, hearts and kidneys. Examples or plant organs are; roots, stems and leaves.
An organ is a group of different tissues that form a distinct structure and function together.
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