Describe the fluid theory of intelligence; then explain your views on this theory
the first step in a research model is

The first step in a research model is finding the research question.

Fluid intelligence could be described as adaptive intelligence - it's the intelligence to solve unpredictable problems and find new solutions. It's contrasted with crystallized intelligence - the intelligence to use the knowledge already acquired. I think that  this is a very important form of intelligence, and likely the kind of intelligence that emerged through the process of evolution.