Question

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What is vibration and vocal cord ​

Answer 1

Answer:

Sound. In order to produce voice, the lungs blow air against vocal folds in the nearly-closed position. Air pushes through the very small space between them and in so doing, makes the covering of the vocal folds, known as the mucosa, vibrate. This occurs by means of a phenomenon known as the venturi effect.

Explanation:

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Answer 2

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To downgrade an app first do the followings:-

• First delete your Brainly app.
• Go to your browser app (Chrome or bing etc.)
• Then search "Brainly app apk files"
• Then you will find many sites but I recommend you uptodown website
• Then click that and you will see like above attachment.
• Click older versions and select 5.30.0 version.
• Then download the file, you will also have to permit to download from another sources.
• After downloading, log in to your account and you can see your bio
• And most importantly, don't forget to disable auto update from play store (2nd picture)