The blank space in the question should be filled with; Literacy and Language development.
According to B. F. Skinner, a learning theorist, who suggests that language develops through the use of reinforcement. Sounds, words, gestures, and phrases are encouraged by following the behavior with words of praise or any thing that increases the likelihood that the behavior will be repeated.
On this note, it follows that the sounds and words are accompanied by a mental map of interconnected sets of word categories.
Read more on language development;
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