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