When I am with same thing as myself, I give you life.
But when I am with two others same as myself, I will protect you.
Who am I?
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Is it
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When I am with same thing as myself, I give you life.
O2 is oxigen, which you need to breath and thus live.
But when I am with two others same as myself, I will protect you.
O3 is ozone, which protects against the deadly rays of the sun.
