Emotional signals, usually from a child's parents, that influence the child's behavior are referred to as:

In associative play,

A) a child plays near other children with similar materials but does not try to influence their behavior. B) a child plays alone or watches other children while they play. C) children engage in separate activities but exchange toys and comment on one another's behavior. D) children orient toward a common goal, such as acting out a make-believe theme.

The lowest and usually most intense frequency of a complex sound is its

a. attack phase. b. decay phase. c. overtone. d. characteristic frequency. e. fundamental frequency.