Answer:
Answer is universal development.
Explanation:
Universal development is a kind of development occurring to everyone through out the world.
In this case, it means that all children throughout the world follow the same path of development to adulthood, no matter where the child is born.
This means that they will start or develop language skills at approximately the same age.
A historian must ask themselves if the source is a primary or a secondary. In order for it to be a real account it must be a primary source, as a secondary source is something written or based off of the primary source.
