4
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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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7
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Is it

O

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.

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