Insects (a class) or a class of invertebrate animals in the Arthropoda phylum. Insects are the most widespread and broadest classification in the Arthropoda phylum. Insects constitute the most diverse group of living organisms on Earth, as they contain more than a million species that have been described, or more than half of all Living organisms, where the number of unclassified species is estimated at about 30 million, meaning that they constitute more than 90% of the various forms of life on Earth.Insects are found in almost all environments, but a small number of them have become accustomed to life in the aquatic environment, that is, the type of housing. It is dominated by another class of arthropods, crustaceans. To date, approximately 5,000 species of caterpillars, 2,000 species of praying mantises), 20,000 species of grasshoppers,