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.
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
they are helpful not harmful to plants
harmful
Depends on what part of "harmful" or "helpful" you are referring to.
helpful
Helpful
helpful