You're raising an extremely complex issue, and I don't think I can give you an answer.
I would say that science has developed over hundreds, even thousands, of years from elements that have constituted the modern sciences. The same is true in the indigenous context.
There isn't one science, but rather many sciences. Science makes it possible to understand social and environmental realities and phenomena in a host of fields. That enables us to create common knowledge. Science operates at the collective level, whereas we previously tended to view it as highly individualistic.
The same is true in an indigenous context: knowledge is kept collectively. When you acquire a piece of information from an individual person, what you get is only a very small part of the knowledge system.
As for the characteristics of science in general, I can't name them for you, except to say that, based on my experience as an anthropologist, there are various sciences and practices, but the idea is always to create knowledge that is validated by peers and placed in a collective context, unlike an opinion. An opinion isn't knowledge; an opinion is an individual point of view. Knowledge, on the other hand, is validated information that, once contextualized, studied and explained, becomes part of a common body of knowledge. And that's where the problem often arises.
So when we want to contact people to elicit their knowledge, they can give each of us information as individuals, but we must understand the system in the same way as we understand science. We must view, as a whole, scientific systems and knowledge systems that have developed in medicine, health and education at the societal level.
Science isn't transmitted by one single person.