The textbook describes a case study of a young girl named Genie who was isolated and severely abused.Because her parents never communicated with her in words,Genie lacked exposure to language during her early childhood years.Although she was able to make some language advances while in extensive rehabilitation,as an adult Genie still speaks in short mangled two- or three-word sentences.This case study suggests that language development _____.

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The case study of Genie shows that language development can be influenced by the environment. Genie's lack of exposure to language during her childhood resulted in significant language deficiencies, even though she was able to make some progress in language development during rehabilitation. This suggests that the environment can play a crucial role in language development, particularly during early childhood years. Option A is incorrect because while Genie did make progress in language development during rehabilitation, her overall progress was limited, and she still struggles with language as an adult. Option B is incorrect because while genetics and biology can play a role in language development, this case study highlights the impact of environmental factors. Option D is incorrect because language development does not cease during adulthood but rather can continue to develop and change throughout life.

The Textbook Describes a Case Study of a Young Girl