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Most diversified arthropod class

Specify, which arthropod class forms most diversified animal group of planet? How the evolutionary success can be explained?

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Insects are the group of animal having most diversity of the species. Around 750000 insect species are there, approx 55% of already cataloged species of the living beings. It is computed that the unknown number of species of insects can be over 2 million. The population of insect over the planet is approximately computed to be more than 10 quintillion (1000000000000000000) individuals. This great evolutionary success of insects is due to the factors like: alimentary diversity, and small size making possible the exploration of several different ecological niches; wings which provide more geographic spread; tracheal respiration which provide them motor agility; high reproductive rates along with the production of great numbers of descendants.

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