lion are useful and harmful
It is not harmful. Also it is not useful
no you cannot tell when a butterfly is harmful or not because they are not harmful they are just insects that God created on His earth that He wanted to create
no they are harmless
no its a butterfly its not harmfull at all
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
i think its both harmful and useful
it is useful
no, it is not helpfull.
They're not
Ozone at ground level is harmful. It is useful in stratosphere as it protects us from harmful UV rays.
It is useful because we can breathe it.