Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms.[1][2] The total number of extant species is estimated at between six and ten million;[1][3][4] potentially over 90% of the animal life forms on Earth are insects.
The most diverse insect groups appear to have coevolved with flowering plants. Adult insects typically move about by walking, flying, or sometimes swimming.
Insects are the only invertebrate group with members able to achieve sustained powered flight, and all flying insects derive from one common ancestor. Many insects spend at least part of their lives under water, with larval adaptations that include gills, and some adult insects are aquatic and have adaptations for swimming.
Humans regard certain insects as Pests, and attempt to control them using insecticides, and a host of other techniques. Some insects damage crops by feeding on sap, leaves, fruits, or wood. Some species are parasitic, and may vector diseases. Some insects perform complex ecological roles; blow-flies, for example, help consume carrion but also spread diseases. Insect pollinators are essential to the life cycle of many flowering plant species on which most organisms, including humans, are at least partly dependent; without them, the terrestrial portion of the biosphere would be devastated.[7] Many insects are considered ecologically beneficial as predators and a few provide direct economic benefit. Silkworms produce silk and honey bees produce honey and both have been domesticated by humans. Insects are consumed as food in 80% of the world's nations, by people in roughly 3000 ethnic groups.[8][9] Human activities also have effects on insect biodiversity.
https://en.m.wikipedia.org/wiki/Insect
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