The first two-word sentence appears at about 21 months of age

Raul is writing his psychology term paper on "attention deficit disorder." To find information about his topic, he goes to a specialized online database offered by the American Psychological Association

He searches for his topic by entering the key words with each record in this database consisting of an abstract plus notes about the author, title, and source. Raul is using the online database known as----------------------- fill in the blank with correct word

The ability to form and use mental representations sets the stage for the development of:

A) basic learning ability B) egocentrism C) language D) complicated motor patterns E) mathematical thinking