It's important to go beyond fossils to substantiate your case of evolution by natural selection and/or mutations that formed species that lasted or may not have lasted. (Gorillas are still gorillas and finches are still finches and Nepalese humans are still humans...) In the meantime, if someone were to see a fossil of a fish type with 4 appendages, he might say, hey look! that's proof that fish evolved to land animals. But is it? Not necessarily. Because there's nothing beyond that showing "the next step" or mutation. And nothing before that to show how and where the Tiktaalik came from (evolved from). Deny or argue away, please...As a form of recognizing what you might say, I can say that it's "logical" for some to put in the missing data, such as pretending to know the exact way it happened. Internally and externally. Life goes on...
I realize that's what you believe.
Well now let's see -- what exactly do they predict that specimen evolved from? And what did it supposedly (specifically) evolve to? Any information from SCIENTISTS you know of as to what it evolved FROM (specifically which fish) and what it evolved TO (again -- what organism exactly).
That's all for now.
I shouldn’t be surprised, but I am, that you keep repeating the same errors over and over again, without learning anything new. So yes, WOW, the Jehovah’s Witnesses have fully indoctrinated you to being stubbornly ignorant to learning & understanding from from one’s errors and remedial the mistakes with correct information…in this case the correct scientific & biological sources, not the fallacious and false propaganda (JW or creationist) sources that you have been using.
Where do you think tetrapod land animals inherited bones, jaws, vertebrae, brains, and so many other physical traits from?
Fishes, in times of - as in tens of millions of years - times prior to the earliest but extinct tetrapod amphibians.
But none of that occurred overnight, and not every fishes were “tetrapod-like”, which biological term is Tetrapodomorpha.
The following clades of Sacropterygii - Tiktaalik, Acanthostega, Ichthyostega, and others, are extinct tetrapod-like (Tetrapodomorpha) sacropterygians. Yes they (eg Tiktaalik, Acanthostega, Ichthyostega) were still fishes, the lobe-fins develop bones that increasingly arms, wrists and digits like those of true tetrapods, eg the earliest but extinct species of amphibians.
Note that, not all sacropterygians were Tetrapodomorpha. Other non-tetrapod sacropterygians continue to thrive, especially the ancestors to the living species of lungfishes and coelacanths. The Tiktaalik, Acanthostega & Ichthyostega are groups of the Sacropterygii that evolved from the Stegocephali. The tetrapod-like sacropterygians and non-tetrapod sacropterygians have diverge at some points in time, and they continue to go their separate branches.
The Ichthyostega have evolved from the earlier Tiktaalik & Acanthostega, developed limbs and lungs that were more adapted for terrestrial life than the earlier Tiktaalik & Acanthostega. The Ichthyostega were closer to the amphibians than the Tiktaalik & Acanthostega, that biologists referred to the Ichthyostega being “stem-tetrapod”.
There were many groups of amphibians that flourished during the early Carboniferous period, branching out in different directions. All amphibians, extant and extinct, still shared to at least 2 things in common with fishes, they are cold-blooded (ectothermic) and still lay their eggs in watery environments (anamniotes). How they differed from fishes, they can move about more in terrestrial environments because they have four limbs (hence tetrapod) and have lungs that sufficiently allow them to stay on dry lands.
How they differed from other tetrapods, like the reptiles and mammals, is as I have above, amphibians were still anamniotes, like their fis ancestors, they laying their eggs in aquatic environments.
Reptiles and mammals including their extinct ancestors were and are amniotes (Amniota is the clade of superclass Tetrapoda),
(A) animals that can either lay their eggs on dry lands,
(B) or animals that can retain the growing embryos in female wombs for some periods, prior to giving life through live birth.
The amniotes evolved from the earlier but extinct amphibian group, most likely from the group known as the Lepospondyli.
The lineage from fishes to tetrapods - such as amphibians, and the lineage from amphibians to amniotes, are quite complex, that I am yet to fully understand, but at least I am open to learning & exploring more…unlike you.
