According to Freud, the stage of psychosexual development in which the child's erotic feelings center on the bladder, bowels, and the process of elimination is the ______ stage

A child in which of Piaget's stages has difficultywith conservation problems?

A) concrete operational B) formal operational C) sensorimotor D) preoperational

To state that a particular teratogen has an effect during a "critical period" means that it:

a. can affect organ systems that are critical for sustaining life b. can cause the mother to become critically ill and perhaps die c. exerts its effect on development only during a particular stage of development d. will require the mother to be hospitalized, most likely in a critical care unit