Yes- they can physically move things and harm people.
They can throw thigs around, play havoc with electricity abd harm people
a person who studies paranormal thing or unusual things including ghosts, poltergiests, and ufo's
It depends what kind of ghost. Demons are evil, they do nasty things to people, like in paronormal activity. Spirits are usually ancestors who are simply watching over you. They do not wish to harm you. Poltergiests do not hurt you, but they damage your belongings. There are many other types that do not fall into these catergories, but they are not as common as the above. These are the most common varieties. :)
They eat you...
If demon means something evil, they can harm us.
intend to do us harm
they have claws to pinch us and the stinger at the back can sting us :)
they become harmful to us at night when they exhale carbondioxide
because of they poisunois plants
More power to you; no harm in asking.
Unicorns are really harnful ...
yes because the sharks eat the nasty animals that at harm us