The normal process by which the existing epithelial cells of skin are replaced by new epithelial cells is called

Apoptosis is a form of programmed cell death that occurs in multicellular organisms . Biochemical events lead to characteristic cell changes and death. These changes include blebbing , cell shrinkage , nuclear fragmentation , chromatin condensation , chromosomal DNA fragmentation, and mRNA decay. The average adult human loses between 50 and 70 Billion cells each day due to apoptosis. For an average human child between the ages of 8 to 14 years old approximately 20 to 30 billion cells die per day. Ref - sciencedirect.com