No
They poo on them
Virus is most harmful
Many fumes are harmful in fact most fumes are harmful. There are many type of fumes and most of them are harmful but they can be filtered and cleansed to stop them harming th eenvironment
Refrigerants are harmful. But the most harmful are CFC's.
they can carry loads of harmful diseaces
virus
Yes because most bats drink blood and guess what ducks have a lot of blood in their bodies.
A carbohydrate can be useful or harmful depending on the type that is eaten. Good carbohydrates have fiber in them.
not all bats are harmful to people it eats fruit and insects only the vampire drinks blood of people and animals
Gamma radiation.
Saturated fats.