(B) The $O_3$ (Ozone) layer is a naturally occurring region of the Earth's stratosphere that absorbs most of the Sun's ultraviolet $(UV)$ radiation. I

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(B) The $O_3$ (Ozone) layer is a naturally occurring region of the Earth's stratosphere that absorbs most of the Sun's ultraviolet $(UV)$ radiation. It acts as a protective shield for life on Earth. In contrast,biopollutants,nuclear blasts,and deforestation are all harmful to the environment and living organisms.