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But is it really possible to come back from the dead? And what's the difference between a living creature and a dead body anyway? Randall Hayes delves into the scientific theories that seek to answer these age-old questions.
- 2 min
But the current understanding of why things die is a little more specific. When organisms reach sexual maturity, the force of natural selection weakens, and the ageing process begins, leading...
Death is the end of life; the irreversible cessation of all biological functions that sustain a living organism. [1] The remains of a former organism normally begin to decompose shortly after death. [2] Death eventually and inevitably occurs in all organisms.
Key learning points. A living thing is something that is currently alive and needs food, air and water to stay alive. Something that is dead was once living but is no longer alive. A non-living thing is something that has never been alive.
Definitely not. The brain and nerve cells require a constant supply of oxygen and will die within a few minutes, once you stop breathing. The next to go will be the heart, followed by the liver, then the kidneys and pancreas, which can last for about an hour.
Oct 21, 2021 · Our definitions of life and death have changed radically over the years, from the loss of a heartbeat to the absence of brain activity. Even now, we struggle with what death is. This chapter will focus on the biological definition of death.
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May 27, 2015 · It's not that living things die; it's that multicellular organisms die. But why? Every single-celled organism alive today has been in existence since life began over 3 billion years ago.
