The uniting of the egg and sperm (conception) typically takes place in the

Helen has just learned to roller skate. To skate, she must balance on the wheels, move her legs back and forth to propel herself forward, and keep her upper body balanced on top of her legs. Helen can skate because she has developed:

a. agility b. coordination c. reaction time d. speed

Through play, preschoolers learn to make plans and carry out tasks during which of Erikson's psychosocial stages?

a. trust versus mistrust b. autonomy versus shame and doubt c. initiative versus guilt d. industry versus inferiority