Next: they eat leaves,roots,wood,nectar and some of them stay up all night and sleep all day they.
Benefit of insects are, they provide useful service to mankind. For example bees use the nectar from flowers to make honey. Insects can also help mankind by pollinating food and crops. People who study insects are called Entomologists.
Some insects have large compound eyes which affects their vision. When looking for food some insects suich as the butterfly have taste sensors on their feet.