Dragonflies are helpful to humans because they eat flies and midges and many other irritating insects that accumulate in large numbers where we do not want them. They are not harmful at all to us.
a dragonfly is helpful to its environment because it lays eggs
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Dragonflys are not harmful that idiot lied they do bite to try to escape but are not harmful
it can be helpful or harmful
sometimes they are helpful and harmful.
Sandpaper is both helpful and harmful.
they are helpful not harmful to plants
helpful
helpful
Depends on what part of "harmful" or "helpful" you are referring to.
Harmful bacteria will harm you. Helpful bacteria will help you.
Slash and burn does not sound helpful, it sounds harmful.