They are more helpful than harmful. My two gerbils are both helpful. They've helped me in many ways and so that's why I say they're more of helpful than harmful.
Sandpaper is both helpful and harmful.
Bacteria can be both harmful and helpful
they are helpful because they are
Both
both
Both only when it infects it is harmful
They are helpful because they clean out intestines. they are harmful because they can cause diseases
If you need help I recommend you type in the specific question you need help with
computer.. both helpful and not..
a bacillus bacteria
They are not harmful they are verynice animals they do not hurt anyone or anything.
Both. It depends what type of octopus it is.