Behavior characterized by lack of desire for social relationships and lack of enjoyment in activities may indicate ________ disorder.

Development in __________ allows children in middle childhood to respond rapidly to changing information, like hitting a tennis ball or catching a baseball?

a. reaction time b. eye-hand coordination c. myelination d. muscular virility

Which of the following is an expressive trait?

a. self-confidence c. consideration b. mechanical aptitude d. dominance