What is the case in which you would -not- call a biological change "evolution", and how is that different from the mere criteria for "reproduction"?
To start with, any time the change was brought about by deliberate, external intervention. For example, Bt-expressing corn, or glyphosphate-resistant crops, are obvious examples of "intelligent design" in the literal, non-pseudoscientific sense. We know this because "we" (i.e. humans) made these modifications ourselves, by a known and reproducible mechanism. I would argue that conventional breeding isn't really "evolution" either, although it relies on more natural phenomena rather than direct genome manipulation.
The fact that these biological changes are genuinely intelligent design does not prove the general case, however, because we've only had the technology for direct genetic manipulation for a few decades, and only know about selective breeding for a few millennia. For other biological changes, we assume evolution, because the directly observed mechanisms by which evolution operates rely on processes that we know have been possible for hundreds of millions of years (if not billions). If you want us to start considering intelligent design, you need to demonstrate a mechanism that predates human civilization.