The most recent common ancestor to all living salamanders certainly had at least aquatic larvae, and probably an entirely aquatic life cycle, much like a hellbender.
Some are aquatic. All salamanders start life aquatic. But only a few are aquatic as adults.
They do not.
gradually gradually
I believe that the hypothesis has something to do with the evolution to the varying ecosystems .in which salamanders live. the aquatic salamander evolved most likely to benefit in its area. A great area that may be referred to for this is Darwin's theory, of natural selection
The population has evolved into two separate species if the species in question no longer interbreed.
Frogs evolved from salamander-like amphibians. They exist since the Triassic, some 200-250 years ago.
No. Lizards evolved from a separate group of reptiles and, as far as reptiles go, are not closely related to dinosaurs. The modern "evolved form" of the dinosaurs is actually the birds.
Darwin concluded that organisms on the Galapagos Islands had evolved (changed gradually over time).
It was more of a discovery than an invention. And it was not a single person who discovered it. The law gradually evolved over time.
The finches evolved differently by living on separate islands.
No single person wrote, invented, or discovered this law - our knowledge on this law evolved gradually over time.
English gradually evolved from other languages, it wasn't invented at a specific time. Consequently, there is no first English word, just lots of words from old Norman and French and Latin gradually changing into what we call English.
David and Jamie's relationship evolved over time. Evolve means that something changed gradually. Sometimes when things evolve they are no longer recognizable.
I don't think there is such a thing. Our modern concept of energy evolved gradually over time; no single person can be credited for discovering it.