Exam 11: Development-Part C

About 65% of female American teenagers wait until they turn 18 years of age before engaging in sexual intercourse.

Once the principle of conservation is understood,children enter the formal operational stage of cognitive development.

Well over 50% of American infants display a secure attachment style.

Enlargement of the breasts in girls is a primary sex characteristic that occurs during puberty.

Infant temperament is largely the result of biology.

John Bowlby claimed that human infants smile and coo as a way of keeping their caregivers close.

The zygote develops into a fetus at around 2 weeks after conception,when it implants into the uterine wall.

Research has indicated that sex education does not increase the likelihood that adolescents will engage in sexual activity.

Piaget's first stage of cognitive development is termed the preoperational stage.

The onset of puberty occurs about 2 years earlier for girls than it does for boys.

Kohlberg believed that most adults reach the postconventional stage of morality.

Infants learn to control their arms before they learn to control their legs.

The typical infant can lift up its head before it is able to master rolling over.

The onset of puberty is accelerated by an increase in body fat.

Newborns exhibit a strong rooting reflex when you lightly touch the soles of their feet.

The overwhelming majority of American mothers report that their children are a source of happiness all or most of the time.

The quality of attachment between child and caregiver is dependent on both the caregiver's behavior and the child's temperament.

Egocentrism is the failure to understand that the world appears differently to different observers.

Typical late-adolescent children spend considerably less time with same-sex peers as they did during early adolescence.

Newborns can mimic the facial expressions of adults.