Hi, it'll help if you research what speech is and what language is to know how important it is to have environments that support them both/enable them to be used.
Speech and language are aspects of communication that help to discover and master skills for life. Life skills enable positive outcomes, choices and the ability to make healthy decisions.
This video on hounslow.gov.uk speech & language therapy section is good -
importance of speech & language
Ultimately if an environment doesn't support speech & language, speech and language won't happen or will be minimal.
Hth xx
why is it important to have an environment that supports speech and language
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