Final answer:
The epidermis is composed of multiple layers of cells, with the outermost layer consisting of flattened and dead keratinocytes that are constantly replaced.
Step-by-step explanation:
The subject of this question is Biology.
The epidermis is composed of multiple layers of cells. The outermost layer, called the stratum corneum, consists of flattened and dead keratinocytes. These keratinocytes are continuously sloughed off and replaced by cells from the deeper layers.