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  1. By using sound in frequencies that reflect off body tissues.

  2. By measuring the time it takes for the reflected sound wave to be detected.

    :) :) :)

:) :) :) :) :)

:) :) :)

:) :) :) :) :)

:) :) :)

:) :) :)

:) :)

(I made a smiley face man :D)

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Cookiies4U

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4y ago

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