Campbell Leaper, a researcher at the University of California, believes that the choice of toys is important. Both boys and girls, he need"tas says, oriented" toys such as take-apart cars. With these toys, they practice t language that they will need, as adults, in situations. Both boys work such these 45 girls also need"social, interactive" With toys, they practice the conversation a grocery store. with kind of that is necessary in relationships a friends and family. The data suggest that biology does not have to b self fulfilling prophecy. Leaper concludes that verbal is the result of both nature and nurture. Parents respond 50 biology, but they can choose a might naturally to their baby's with this variety of toys and can choose how to talk child.