Proto-communication
Positive infant language
Pre-speech
Answer option 4
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Observing quietly without being seen.
Observing from close by, but occasionally interacting with the subject.
Controlling the experiment as closely as possible.
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Verbs
Inflections
Articles
Auxiliary verbs
Nouns
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The time it takes to get results
The emphasis it places on the role of parental and social approval
Lack of accuracy
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