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Study the following statements about ozone:1 It is essential for breathing of living organisms.2 It is used to disinfect water.3 It absorbs ultraviolet rays.4 Its proportion in air is about 3%.Which of these statements are correct?

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Study the following statements about ozone:<br>1 It is essential for breathing of living organisms.<br>2 It is used to disinfect water.<br>3 It absorbs ultraviolet rays.<br>4 Its proportion in air is about 3%.<br>Which of these statements are correct?






 
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