harmful
The question is incomplete. No options (for which of the following) are given to answer the question.
Bacteria can be both harmful and helpful
They are helpful because they clean out intestines. they are harmful because they can cause diseases
Bacteria can be helpful by deleting bad viruses and harmful by killing you
Jelly Fungi is Helpful.
If you need help I recommend you type in the specific question you need help with
The question is incomplete. No options (for which of the following) are given to answer the question.
it can be helpful or harmful
sometimes they are helpful and harmful.
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
they are helpful not harmful to plants
harmful
Depends on what part of "harmful" or "helpful" you are referring to.
helpful
Helpful
helpful