This result is taken from a study led by Robert Plomin using twins as the main test subjects. This indicates that it is true that intelligence can be influenced by environment and genetical factors , but genetical factors since play a larger part.
Highly intelligence people tend to have the abiltiy to process new information at a much faster rate compared to normal people and have a naturally larger brain capacity to store that information longer. This basic ability cannot be replicated with training or nutrition.
For the feudalism chart, 1. King 2. Nobles 3. Knights 4. Peasants and serfs For the catholic church chart, 1. Pope 2. Cardinals 3. Archbishops and bishops 4. Priests