This is not as clear cut a question as the earlier ones, and if you do not know an answer then it will be difficult to figure one out just based on intuition. (But perhaps possible).
If you are intrigued by the question and would like to explore what an answer could be, I would be interested to know how you tried to find an answer. Asked a colleague? Looked at a book (which?)? Looked online (where?)?
Here is the question:
A differentiable complex function automatically has derivatives of every order. (In contrast to differentiable real functions that need not have even second derivatives at any point.)
Can you describe this “miracle” as part of a more general phenomenon?