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Rattlesnakes are entirely beneficial as long as they are left alone. They consume large numbers of rodents which can carry diseases harmful to humans and they damage or destroy human food and crops. If you mess with rattlesnakes, however, you could end up in the hospital for several days being treated for a venomous snakebite.
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Helpful?
If you need help I recommend you type in the specific question you need help with
Is salt helpful or harmful?
it can be helpful or harmful
Are mangroves helpful or harmful?
sometimes they are helpful and harmful.
Is sandpaper helpful or harmful?
Sandpaper is both helpful and harmful.
Are stick bugs helpful or harmful to the environment?
they are helpful not harmful to plants
Are polar bears harmful or helpful?
Depends on what part of "harmful" or "helpful" you are referring to.
Are crickets harmful or helpful?
helpful
Are caterpillars helpful or harmful?
helpful
What are some harmful and helpful bacteria?
Harmful bacteria will harm you. Helpful bacteria will help you.
Is slash and burn helpful or harmful?
Slash and burn does not sound helpful, it sounds harmful.
Harmful or helpful effect of polybags?
helpful
Are humpback whales helpful or harmful?
Helpful.
