Why is immortality impossible?

Immortality is considered impossible primarily due to the biological processes of aging and cellular degeneration, which are inherent to all living organisms. Factors such as genetic damage, telomere shortening, and the accumulation of cellular waste contribute to the eventual decline of bodily functions. Additionally, the complexity of maintaining homeostasis in an ever-changing environment poses insurmountable challenges. Philosophically and ethically, the implications of immortality also raise questions about the value of life and the natural cycle of existence.