Answer:
Light waves are electromagnetic waves while sound waves are mechanical waves. :)
The average adult in the us spends 24 hours watching televistion each week
Answer:
Their function is to produce sound by allowing the free edges of the folds to vibrate against one another and also to act as the laryngeal sphincter when they are closed.
It took so long because at the time there was no way for people to study the behavior formally. im not sure what helped it get recognized but i know wihelm wundt helped get it recongnized.
sorry i couldnt be much help
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