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A bacteria adapting to antibiotics, isn't even becoming a new species.
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Okay, I'm no expert at evolution at all, never having really studied it, since it makes perfect sense to me, and I've never seen any need to question it. Perhaps that's not good, but I don't care. So I'm not going to pretend to be right, but instead just present my observations.
How can you say that if a bacterium species changes it isn't becoming a new species? Obviously we call it the same thing, because it would be mighty difficult to keep changing the name every five minutes, and hence we class both the before- and after-products, as it were, as the same species. But since the 'original' form no longer exists, who's to say that they could or couldn't have bred, which, as is my understanding from Sydney and Dictionary.com, the definition of whether or not something is or isn't a species.
In the case of lions and tigers producing ligers (which I had not heard of), and horses, ponies and donkeys producing mules and hinnies, maybe these are the exceptions which prove the definition of a species. It's a far cry from 'the exception which proves the
rule, I know. But the thing that most comes to my attention about all of this is what taxonomy all really is. It's not a science, as such, it's just a way of cataloguing animals, plants, fungi, protoetists, algae and monera. Opinions on which genus or class a creature belongs to is disagreed upon within the scientific community, even how many families of life there really are - most scientists stuff algae in with the protoetists, many refer to protoetists simply as 'protists' or something similar. Woe betide any so called scientist who still dumps everything in either 'plant' or 'animal' catagories, but you get the idea. I don't think I'm trying to reach any sort of conclusion here, just trying to break down, or possibly build up, what you consider a species with reference to the bacteria of debate.
As for what scientists believe, well they're a fickle lot. The UN scientists keep blathering about global warming, the most dreadful thing ever to beseige our planet, a process so unnervingly deadly and vile that it doesn't actually exist. We're coming out of a minor ice age, of course the planet's going to get hotter.
There are scientists who still claim the world is flat, maybe they're right and everything modern science tells us about the spherical nature of planets is just an illusion.
Fossil record: if you're going to start telling me, like those Jehova's Witneses did, that God planted them in the ground, you needn't bother.
Well, there's my uneducated on-the-spot analysis.