Heritability evidence suggests genetic influences on various aspects of executive function, including combining information in working memory, controlling attention, and inhibiting inappropriate responses.

The answer to this question is substantial
substantial genetic refers to the genetical factors that contribute to the development of infants.
The development in this context refers to the increase of a wide variety of brand and body's function such as improvement in brain function, ability to control emotions, etc.

6, 4, 5, 1 are true. the others are false.