The fact that children in all cultures are able to master the rules of language relatively early in life without formal instruction most strongly suggests that:

It suggests that language acquisition may have a biological basis.
The theory was presented by  “Noam Chomsky” who argued that human being have an innate ability to learn language and that is why children have this tendency to understand language rules early in life. The theory was called "Universal Grammar". 

where is your diagram?

unknown. best bet to watch it is at kissanime (a lot of popups and has ads and has potential to be a virus not recommended) or crunchyroll (recommended but has ads and has no popups). you will have to wait. i really want netflix to give the other seasons.