Nathan has a seven-year history of mild mood swings. When he is "high," he is coherent; when he is "low," he is never suicidal or unable to function. What is the best diagnosis for Nathan?

Babbling refers to

a. speech-like sounds that consist of a vowel and consonant but that have no meaning. b. the production of vowel-like sounds such as "ooooooo" or "ahhhhhhh." c. a pattern of rising and falling pitch. d. a distinctive style of speech adults use when talking to infants.

In early childhood (from ages 3–6) ____________________________

a. fine motor skills are refined, but gross motor skills remain the same as they were in toddlerhood b. children from high socioeconomic status tend to have better gross motor skills than their counterparts from lower socioeconomic backgrounds c. girls and boys are equally skilled at body-coordination skills, such as balancing on one foot d. gender differences in gross motor development appear.