The blank spaces in the task content should be filled with is; Three(3), atmosphere and ultraviolet rays of the sun.
What is Ozone?
Ozone is a trioxygen molecule; contained in the upper atmosphere with a sole aim of protecting biological life against ultraviolet rays of the sun. The ozone layer is however depleted to Oxygen molecule in the lower atmosphere.
Read more on ozone layer;
https://brainly.com/question/15444718
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