Beetles and other amazing insects. Find out the world. Afonkin S.Yu.

People sometimes think that a person is the main result of evolution on planet Earth. Many zoologists believe that this is not so. The closest relatives of a person - monkeys - are few and occupy a very modest place on our planet. Without clothes and technical devices, a person is able to survive only in the tropics. The real leaders of the kingdom of animals are crayfish, spiders and insects - creatures that are combined into the type of arthropods. The number of their species exceeds 3 million. They live in all reservoirs - from quickly drying puddles to the deepest ocean depressions. Arthropods crawl along the snow and ice and feel great in hot springs. They mastered all the corners of land, from caves to mountain peaks, from tropics to deserts, and learned to fly. In each cubic meter of soil there can be hundreds of thousands. Arthropods are able to eat wax, wool, feathers and not drink all their lives. Many of them eat a person, parasitize on him and are able to kill him in a matter of hours.

What allowed the arthropod to become such a successful group of organisms?