Study the following statements about ozo...

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

A

a),b) and c)

B

b) and c)

C

a) and d)

D

All four

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