How many chunks of information can a typical adult keep in short-term memory at one time?

When parents make frequent comparisons between same-sex siblings who are close in age,

A) children strive harder to develop independent personality traits. B) siblings make gains in perspective-taking skills. C) sibling rivalry tends to increase, particularly during toddlerhood and the preschool years. D) it results in more quarreling and antagonism for the children.

During puberty, changes in physical maturity that are not directly linked to reproduction are referred to as ____ sex characteristics

a. primary b. secondary c. tertiary d. instrumental