Dobsonflies are neither helpful or harmful. They only come out of hiding to mate, and usually live under rocks until they molt.
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Dobsonflies eat small bugs and some plants
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.
helpful