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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
Depends on what part of "harmful" or "helpful" you are referring to.
Dinoflagellates can be both helpful and harmful. Some species are important producers in marine ecosystems as they play a key role in the food chain. However, certain dinoflagellates are also responsible for harmful algal blooms that can have negative impacts on marine life and human health, through the production of toxins.
helpful
helpful
Harmful bacteria will harm you. Helpful bacteria will help you.
Chipmunks can be both harmful and helpful. While they eat insects that can damage gardens and crops, they also consume and damage seeds, fruits, and bulbs. Additionally, chipmunks can carry diseases and parasites that may be harmful to humans and pets.
Slash and burn does not sound helpful, it sounds harmful.