Ozone at ground level is harmful. It is useful in stratosphere as it protects us from harmful UV rays.
Chemists see whether chemicals are harmless, harmful, lethal, or what they are useful for.
In what ways is antarctica be useful for humans
no
lion are useful and harmful
It is not harmful. Also it is not useful
Very, they can sting you.
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The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
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useful
oxygen
i think its both harmful and useful