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Both, some bacteria is very useful and good for you, like in yogurt. Other bacteria is very harmful and can make you very sick, like staph in staph infections.
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Are lions harmful or useful?
lion are useful and harmful
Is a ameoba harmful or useful?
It is not harmful. Also it is not useful
What are Useful and Harmful Changes?
The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
Is a butterfly useful or harmful?
useful
You cook some chips in the oven useful or harmful?
i think its both harmful and useful
Is natural gas useful or harmful?
it is useful
Which are harmful and useful to human being?
Ozone at ground level is harmful. It is useful in stratosphere as it protects us from harmful UV rays.
Is carbohydrate useful or harmful?
A carbohydrate can be useful or harmful depending on the type that is eaten. Good carbohydrates have fiber in them.
List down 10 useful 10 harmful changes in the environment?
changes both harmful and useful
Is oxygen useful or harmful?
It is useful because we can breathe it.
Is lassa virus harmful or useful?
useful for dieing (;
Is cooking chips in the oven harmful or useful?
It is USeful
