Are most of the cells in our body differentiated or undifferentiated?

Most cells in the body differentiate.

Explanation:

Cells differentiation is the ability of cells to change form and develop into specialized cells to perform specific functions. These cells in the body retain their ability to divide and form different cells types. Examples include somatic cells  such as muscles and skin cells,stem cells and germ line cells which differentiate into gamete cells. Some cells do not differentiate in the body.

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segmented body, an exoskeleton made from chitin, and joint appendages.