All living organisms consist of cells as their basic building blocks. Specific kinds of cells perform specific functions. Cell differentiation is the process by which cells become specialised for a particular job. During the development of a multicellular organism, differentiation occurs.

Organs are formed by tissues, which are formed by specialised cells. Throughout large multicellular organisms, different mechanisms exchange and transport materials.

What is a tissue?

Tissue is a group of cells that have similar structure and that function together as a unit.

There are many types of cells in a tissue. Humans, for example, have a variety of tissue types:

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