helpful
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it can be helpful or harmful
only if you eat them
Buckeye caterpillars are not poisonous. There are some caterpillars that do contain toxins that is harmful to humans but the Buckeye is not one of them.
sometimes they are helpful and harmful.
Sandpaper is both helpful and harmful.
Yes, actually they are helpful. I had a wart on my elbow and a oldtimer told me to let the katydid bite my wart and it would go away. I tried it and sure enough in about 2 days the wart was gone! I couldn't believe it!
they are helpful not harmful to plants
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.