The mechanism by which cultural tools, such as abacuses, influence cognitive development is ___

Concepts are ideas that represent _____

A) a class or category of objects, events, or activities that share core properties B) patterns of behavior C) higher-order conditioning and secondary reinforcers D) tangible objects

Which of the following statements is true about language?

A) It is not symbolic. B) It can be written, spoken, or signed. C) It is incapable of an infinite set of meaningful utterances. D) It has no set structure or rules that must be obeyed.