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 "Fluidity of racial categories aside, the "biologification" of race in Brazil referred above would match contemporary concepts of race in the United States quite closely, though, if Brazilians are supposed to choose their race as one among, Asian and Indigenous apart, three IBGE's census categories.". Is that enough to answer the question?
Answer: yes