I want to know the answer to the following question:
What categories have an aspect of fluidity?
All the background I'm provided with is that "While assimilated Amerindians and people with very high quantities of Amerindian ancestry are usually grouped as caboclos, a subgroup of pardos which roughly translates as both mestizo and hillbilly, for those of lower quantity of Amerindian descent a higher European genetic contribution is expected to be grouped as a pardo.". Is that enough to answer the question?