Supposedly, mollusks or such became fish, and then fish became amphibians to become lizards, or vice-versa.
Evolution.
One is the devolution of fish.
Evolution.
It is called convergent evolution. When two different animals have to adapt to the same environment (both whales and fish have to adapt to marine environments) evolution will make them start to look similar, even though they will still retain fundamental differences. For example, whales are mammals, and fish are... fish
Never. Stunfisk has no evolution.
fish-lizard-dipholosaurs-nanotyranus-albertosaurs-trex
exaption
You can fish for it with the Super Rod below the Fuego Iron Works.
The most primitive fish are typically represented by the jawless fish known as agnathans, which include species like lampreys and hagfish. These fish have a simple body structure and lack jaws, fins, and paired appendages, differentiating them from more advanced fish. They are considered some of the earliest vertebrates, having existed for hundreds of millions of years, providing insights into the evolution of more complex fish and vertebrates. Their unique characteristics make them a significant focus in studies of vertebrate evolution.
Trout bones are important in the study of fish anatomy and evolution because they provide valuable information about the evolutionary history and relationships of different fish species. By examining the structure and arrangement of trout bones, scientists can gain insights into how fish have evolved over time and how they are related to each other. This information helps researchers better understand the diversity and adaptation of fish species in the natural world.
An ichthyologist is a scientist who specializes in the study of fish. They may conduct research on fish behavior, anatomy, genetics, distribution, and evolution. Ichthyologists play a key role in conservation efforts related to fish species and their habitats.
Eusthenopteron is a link in a chain of evidence supporting evolution. Transitional forms have been found that are elements of its development from a fish that lived entirely in the ocean to the tetrapods that walked on land. These progressive changes spanned million of years in the late Devonian, from the fish Eusthenopteron, through Tiktaalik, and Acanthostega, to the oldest known tetrapod, Ichthyostega. Eusthenopteron was fish in the ocean, but a portion of that ocean became landlocked and is now part of Pennsylvania. In Darwin's evolution there are mechanisms for development of new genetic information. One of them is described by Ilya Prigogine. Another is Lamarck's evolution (this requires a feedback loop), which is a subset of Darwin's evolution. A third is... well, I'll leave it to you to research on your own.