Is the following statement logical or is it illogical…?
“Human beings have the capability to someday fly."
What would you say... is this statement worthy of any consideration? Is the human species capable of giving rise to a flying descendant, or is this idea outright impossible?
You are asking questions of what is “possible” or “impossible”.
In the world of philosophies, religions, in human’s wild imaginations (eg dreams, or sci-fi stories for books, tv or films), human developing wings, then it would fall under the category of “possibility”.
In various myths, we have evidences of people’s imagination have sometimes depicted their gods or angels that have human form as well as some might have wings too. Therefore, they believe these winged gods or angels could fly.
Therefore, some people believe that impossible can be possible. But what people believe is possible, through these dreams or wild imagination, it doesn’t mean, they are probable.
In the bible, like that of Ezekiel’s vision in Ezekiel 1, Ezekiel supposedly “witnessed” 4 angel in human form, plus some extra features:
“Ezekiel 1:4-11“ said:
4 As I looked, a stormy wind came out of the north: a great cloud with brightness around it and fire flashing forth continually, and in the middle of the fire, something like gleaming amber. 5 In the middle of it was something like four living creatures. This was their appearance: they were of human form. 6 Each had four faces, and each of them had four wings. 7 Their legs were straight, and the soles of their feet were like the sole of a calf’s foot; and they sparkled like burnished bronze. 8 Under their wings on their four sides they had human hands. And the four had their faces and their wings thus: 9 their wings touched one another; each of them moved straight ahead, without turning as they moved. 10 As for the appearance of their faces: the four had the face of a human being, the face of a lion on the right side, the face of an ox on the left side, and the face of an eagle; 11 such were their faces. Their wings were spread out above; each creature had two wings, each of which touched the wing of another, while two covered their bodies.
Here, this prophet saw not only each angel having “human form” and “four wings”, but also “four faces” and under each wing, “four hands” (so a total of 16 hands for each angel).
Here we see, people who believe in religion and believe in their religious books (hence, in this case, the scriptures they called the Bible), they can believe in the impossible.
But in science, scientists don’t work with “possibility”, but do work with probability. They relied on past observable evidences to predict what is or isn’t statistically probable, hence what is “likely” to happen or what is “unlikely” to happen.
So if you have lot of evidences that back up the prediction and explanation, then that would mean it is probable or likely to be true.
But if you have more evidences against the explanation and prediction or there are no evidences whatsoever, then it either less probable or improbable, hence either not likely or very unlikely.
Natural Selection is about having change in environmental circumstances that will push some species to change genetically and morphologically.
Although it might not be impossible, the probability that environment change will cause humans to grow wings and fly, that probability would fall under the category of “extremely unlikely”.
And that’s Natural Selection only.
What of chances that happening (eg growing wings) through happening through other means by evolutionary mechanisms.
I don’t really understand Genetic Hitchhiking, so I cannot really comment on the probability of growing wings being probable or not. But I am assuming it isn’t probable.
Genetic Flow is where evolution could occur not be environmental changes, but by new population (eg people with wing-like genes, population A) migrating to location with population (B) of humans with no wing-like genes, interbreed with other, to produce new species, where the new generation (population C) have more wing-like development than that of population A.
So far, the studies have shown that there are no humans with genes to grow wings. So with the mechanism of Gene Flow, the probability of man developing wings is improbable or highly unlikely.
Genetic Drift: there are have been no evidences that genetic variance of any human having physical limbs that are wing-like. So again, humans being able to fly would be highly unlikely.
Mutation: so far, looking at the remains and fossils of other hominid, there have been no mutations where they have developed wings, so the probability of occurring some times in the future would seem so remote, scientists would again say that it is highly improbable.
In the supernatural world, like that in the belief in religion, the “impossible” becomes “possible” But in the real world, science don't deal with the impossible, but with the observable “probability”, and so, humans growing wings would fall under the “improbable” category.