Define "engine".
Does Krebs cycle count as one?
In the context I am using , I am defining ''engine'' as an actual internal combustion engine . The metaphor being representive of intelligent design and complex form. Placement of parts being specifically ordered by design .
The human form or other animal species forms are complex forms that have components that are specifically positioned such as eyes , ears , a nose etc.
I don't believe your Krebs cycle is representive of this , so no the Krebs cycle doesn't answer the question and isn't the sort of ''engine'' I am referring to .
''A Petri dish (alternatively known as a Petri plate or cell-culture dish) is a shallow transparent lidded dish that biologists use to hold growth medium in which cells can be cultured,[1][2] originally, cells of bacteria, fungi and small mosses.''
https://en.wikipedia.org/wiki/Petri_dishMy question is asking whether we have ever observed a sample on a petri dish or by other means , evolve into a complex form that has specific placement of ''parts''?