According to the american psychological association, by late adolescence the heritability of intelligence is about percent.

75%

Explanation:

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.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.