Marsupials are helpful to humans in that they keep grasses and plants at manageable levels. They are only harmful to humans when they get too close and scare the animals.
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The ozone is helpful in stratosphere. It protects us from harmful UV rays.
Anger can be helpful as it motivates action and can protect us from harm, but it can also be harmful when it leads to aggression and damages relationships. Fear can be helpful by alerting us to potential danger and keeping us safe, but it can be harmful when it leads to paralysis and irrational decision-making.
it can be helpful or harmful
sometimes they are helpful and harmful.
Some give us nutrients. Some are harmful.
Sandpaper is both helpful and harmful.
Wind is harmful because it can destroy a building and blow someone away at the right speed. On the other hand, it's helpful as it provides us with a source of energy.
they are helpful not harmful to plants
helpful
helpful
Depends on what part of "harmful" or "helpful" you are referring to.