The correct answer is speech impairment.
Speech impairment refers to a condition in which an individual is unable to communicate clearly and be coherently understood by others due to difficulties in their speech and articulation. Individuals with speech impairments might be unable to pronounce words correctly, produce speech sounds and speak with abnormal duration, pitch or vocal quality.
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The similarity is that both are a Plateau: a vast area located relatively high, but which is rather even (this distinguishes it from a mountain range).
The differences are:
-while Atacama is barely populated, the Altiplato has a number of cities, such as Cuzco
-The Atacama receives less precipitation than Altiplato