Death is the end of life. It is the irreversible cessation of biological functions that sustain a living organism; however, the identification of the moment of death presents certain difficulties. Some organisms, such as the immortal jellyfish, are biologically immortal; nonetheless, they can still die from causes other than the effects of aging. Many cultures and religions have a concept of an afterlife. The study of death is known as thanatology.
Background
As of the early 21st century, 56 million people die per year. As of 2022, an estimated total of almost 110 billion humans have died, or roughly 94% of all humans to have ever lived. The cause of death is usually considered important, and an autopsy can be done to determine it. There are many causes, from accidents to diseases or crime and war. The most common reason is aging; the most common cause is cardiovascular disease (CVD), which is a disease that affects the heart or blood vessels. A substudy of gerontology known as biogerontology seeks to eliminate death by natural aging in humans, often through the application of natural processes found in certain organisms. However, as humans do not have the means to apply this...
Extract from Wikipedia: “Death” (CC BY-SA 4.0).
