Lina said:
Ah, just as I was considering weighing in. No, you're right, I'll just keep doing what I've been doing.
Yeah..
Hey, one second.. I have to go talk to QRV, I'll be right back to the benches
QRV said:
I'm sorry to disagree on this last point, evolution hasn't been understood entirely, hence the label of "theory" that's still there.
Evolution is not a theory. It is a real phenomenon that follows logically given relevant physical circumstances.
If you would have some patience, I'll try to explain as best as I can:
Let's say there is a large group of simple entities, let's call them dots. And these dots have only two characteristics. Only two properties:
One is a color. Each one has its own solid color, and overall the dots as a group range in a nice distribution from a green to a yellow. Let's say 25% of the dots are deemed to be unmistakably 'green', and 25% unmistakably 'yellow', with the remaining 50% being greenish-yellow shades of varying degrees.
The other property of these dots is that they make copies of themselves every once in a while, and they all do so at the same rate. And when making a copy, it isn't necessarily a perfect copy. Meaning, the color of the copy would be a very slightly different shade if measured precisely. So, with time, the group of dots has been exponentially increasing in number, and the distribution of color would remain, no matter what the total number of dots is.
But now we'll add some external pressure to the system. Let's say that hyena brings by a zapper. And what this zapper does is discriminately eliminate dots that are yellow (starting from a specific hexadecimal value of a greenish-yellow and anything yellower than that). As time goes by, hyena's toy will keep zapping away all dots yellow. The dots that remain will keep making copies of themselves (and should one be at around the zapper's threshold yellow value, it might find that particular copy of itself zapped).
When measuring the
distribution of colors at this later time, I'm sure you can all correctly guess that it will be different ..that the percentage of green dots has increased. It may be something like 40% unmistakably green, 35% green with a slight hint of yellow, and 25% yellowish-green. Yellow dots, and greenish-yellow dots, no longer exist.
The distribution of a property of a group of entities at a later time after such an external pressure will be different ..it changes. This is evolution.
Note the following too: At no point did any one dot
change. All individual dots existed absolutely unchanged at all times. Only the distribution of traits (one trait in this case) changed. Note also, that nothing in this system was done randomly (the zapper had specific discriminatory instructions). And nothing happened by mere chance. Given specific and physical parameters the system behaved only logically.
The dots evolved.
Perhaps someone who saw the group at a time before hyena's zapper might be able to tell stories of yellow dots having once existed.
To get back to your post,
QRV, what was viewed as a theory many decades ago was that
organisms on this planet came about through the (real) process of evolution. And even more controversially then, that humans were evolved from earlier species.
That was the theory.. that animals evolved. But even this is no longer called a "theory", as you have been thinking. It's simply an information lag: The phrase "
theory of evolution" is still diffused throughout the general population (and of course, strongly held by the hardcore religious). Sure, biologists argue specific pathways at certain times with certain traits, but the evolution of earth's species is, in the present day, very much considered an axiom, not a theory.