How do scientists investigate the neural correlates of consciousness? What key findings have emerged in recent years?

Brain, Body, and Mind
Write a 2000 word critical essay on one of the following questions:
Critically evaluate evidence that intelligence is biologically determined.
How do scientists investigate the neural correlates of consciousness? What key findings have emerged in recent years? Include examples from relevant published studies in your answer
Evaluate modern theories which address the question “How did language evolve in the lineage of higher primates?”