Jelly Fungi is Helpful.
harmful because it makes you sick
mycology
virus
I can't give you a harmful one, but a helpful one is a leech. They create a chemical that stops blood from clotting. Doctors use it after surgery to keep swelling down, which also helps prevent swelling.
They are helpful because they clean out intestines. they are harmful because they can cause diseases
Some give us nutrients. Some are harmful.
harmful because it makes you sick
If you need help I recommend you type in the specific question you need help with
it can be helpful or harmful
sometimes they are helpful and harmful.
only as harmful as peter
Sandpaper is both helpful and harmful.
yes
they are helpful not harmful to plants
helpful
helpful
Depends on what part of "harmful" or "helpful" you are referring to.