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What is life?
What are the most important characteristics that we use to define whether something is living and why? It is a difficult border to set because there will always be an exception, but I believe it is an important distinction because once defined (assuming it is possible) it creates a simplifying division to those entities upon which we can apply certain emotions or qualities – plus, I find it interesting.
Here are some conventional characteristics of life to get us started:
- Growth – stages of development
- Metabolism – consuming, creating, transforming and storing energy
- Motion – internal or external
- Reproduction – ability to create similar, separate entities
- Response – detect and respond to environmental stimuli
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Comments
If it is biological, than what you named are the characteristics of what scientists define as life…
If it is philosophical, then…ah, who am I kidding? I don’t do philosophy… :-p
Andrew Hamann
Jan 7, 08:46 PM #
Maybe we could define life as anything that has a both a definite structural and functional pattern within it or central bluprint (like DNA or RNA) that directs changes within its basic units and thus controls its existence.
Tarun
Jan 8, 01:11 AM #
Glen C.
Jan 8, 09:37 AM #
I think the five points you listed, along with the comments by Tarun, make a very good key for defining what we see life to be. You’re also right in saying that there are always exceptions, such as viruses that only seem to be ‘life’ or living inside a host.
When you think about it, by the very definitions you have listed, an entity such as a computer virus could be defined as ‘life’ or alive. Now it’s getting interesting, go through each point on the list and you’ll see.
Vincenze.
Vincenze
Jan 8, 05:56 PM #
Tarun: Yes, consciousness would be a major factor of what I would consider life. however, there are varying levels of consciousness – would life be associated with consciousness where the organism recognizes itself as a living organism, or something less complex?
The reason I am asking this was because I am wondering when life began. There was a point in the early history of earth where small collections of molecules became something with the attributes of life.
What did they gain or lose that gave them life?
Glen: Yes, I don’t know if that falls into the catchall of “response” that I put up, but it certainly is a valid characteristic.
Vincenze: Yes, there are tons of exceptions, even fire seems to – at least minimally – have each of these characteristics. It grows by consuming energy, it moves and is reproducing in it’s growth and responds to it’s environment such as wind or rain.
Thame
Jan 9, 05:24 AM #
Why?
I believe the point is that we, as a life form, cannot define ourselves the same way a microscope can see the invisible but cannot see itself.
I believe we, as evolved life forms, are the recently formed sensitive organs of the evolving organism that is the universe. Somehow we can peek into the infinity, but we hardly can grasp ourselves.
The Manual's Keeper
Jan 11, 08:44 AM #
Wonderfully put
Thame
Jan 11, 06:27 PM #
Benedict
Jan 12, 03:30 AM #
Life:)
Online
Mar 20, 01:11 AM #
Now what would be really interesting is if humans could create AI that has the ability to grow and to reproduce on its own. When you think about it, these are the only life chracteristics that separate “natural” life from robotics and AI. Could humans someday create organisms from scratch, distinct from any other current living species that have all of the chracteristics of life? If so, what would that say about the existence of God? I suppose not much, since you are still using “God’s” elements to do the creating. Although you’d be making a new creature, you’d still be using the same building blocks that have been around since the beginning of time. (I put God in quotes because I realize that not everyone agrees that God exists).
All these questions about autonomous man-made life make me want to go watch The Matrix, and I don’t even like that movie.
Colleen
Mar 20, 03:40 PM #
“Could humans someday create organisms from scratch, distinct from any other current living species that have all of the chracteristics of life?”
Some argue that there is a non-physical component to life and I would imagine that it would be pretty hard to fabricate.
If not, I think it is only a matter of time before a completely “physical” life is built either from existing organic parts or from scratch.
Thame
Mar 20, 04:41 PM #
What is a life?
Definition :
Anything or body with follow characteristics
1. growth (small to big)
2. reproduce by itself(one to two)
3. can be kill (no growth, no reproduce)
4. can repare itself
5. old to die
Healthy life body
everything in balance
Unhealthy life body
someplace unbalance
What cause unbalance?
1. outside factors
2. other life
unbalance can not repare by itself we call disease
sherman
May 7, 06:30 AM #
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