If the inscet has a sickness they can pass it to us.
Because insects bite and are sometimes harmful to Humans!
No, they don't bite or anything!
not all bats are harmful to people it eats fruit and insects only the vampire drinks blood of people and animals
they have no particular name,they are called non harmful insects
Bedbugs and fleas are harmful because they are insects.
Insects are harmful to crops because they can be carrying dirty kinds of bacteria, and they can cause diseases in plants and kill plants.
They do not
In many areas, grasshoppers are considered harmful insects. They have the ability to devastate large areas of crops and other important plants.
Many snakes can be harmful, but they benefit us by eating rodents such as: mice, rats, and etc. that might carry diseases. Spiders can be harmful as well, they benefit us by eating insects like: house flys, mosquitos, and other insects. They keep the bug population at a normal level.
That would be called biological control of insects.
Some benefits of insects are: pollination of plants by some insects, some beneficial insects eat other, harmful insects.
Harmful insects are insects that are harmful in any way to plants, animals or humans. There are many ways in which insects can be harmful to the above; insects such as locusts can form huge swarms that can destroy whole crops in minutes. Other insects can pierce a leaf or stem of a plant and suck out its juices, leaving the plant to wither and die. Various types of insect carry diseases such as malaria and encephalitis which leave many children in developing countries orphaned and many parents childless.