1. Language development generally takes place in stages. Review page 180, "Visualizing Development - Early Communication and Language Development" of your course text, which discusses the evolution of oral language in young children, and then explain the differences between cooing, babbling, receptive language, and expressive language. Based on the 4 theories of language development theories described on pages 180-185 of your course text, summarize the role of important adults in a young child's language development.