Talk:Godzilla Earth/@comment-3121860-20180306062443/@comment-4820209-20180327194110

Evolution isn't just change over time, it's change in populations over time. Shin Godzilla isn't a population, but an individual, and while mutations could occur in the specific creature which would carry over (potentially) to future generations, it didn't actually evolve in the film.

When Yaguchi says "It's evolving" in reference to Shin changing into its third form, the closest analogy that could be made is that the monster underwent the process of metamorphosis, which is defined as an animal undergoing physical development after birth through an abrupt change. Much like a butterfly would, from a caterpillar. Which is a change, but not evolution by biological definitions.