Some ants and beetles are enticed to bite across wounds and serve as primitive sutures. Some insects are important because they feed on insect pests or weeds. Forexample, the puncturevine weevil is used to control the noxious weed called puncturevine. Lady beetles eat the plant pests known as aphids. Insect pollination assists many crops to set seeds to be planted next year.
Many insects feed on dead plant or animal matter and speed up decomposition and nutrient cycling.