Corinnguard
Hero
Fine, but then you're not in a "scientific mindset" any more.
Which is fine by me. You see, the issue is that all the cool lore around our fantasy-world biology was developed without the smallest whit of a thought to real-world biology. So trying to retroactively explain it with real-world biology will fail.
A wizard studying the remains of a beholder, for instance, is going to be asking themselves a number of questions about how each of the beholder's eye rays work. They might also be asking themselves as to what they hope to get out of their study. Are they looking to create a new spell off of their work? Are they looking to creating a new magic item based off their work? And so forth. So, biology will be involved, just not real-world biology. Their science is a completely different brand of science.The idea of categorizing things according to being a "vegetable, animal, or mineral" was the endeavor of a "scientific mindset." It obviously doesn't match our current understanding of the science. However, this is why I think that a "scientific mindset" does not necessarily mean that it would reflect actual science or real world understandings of phenomena. I don't think that a "scientific mindset" in a D&D setting would look like real-world biology.
The wizard is essentially an arcane scientist within a fantasy setting.