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Insects, like other arthropods, have segmented bodies, main segments on their appendages, and an exoskeleton. Key distinguishing features include: a head with a mouth, no walking limbs, and reproductive openings near the anus; and typically, metamorphosis occurs during development. The world's insect species are estimated to number over 10 million. However, only about 1 million species have been recognized by humans, which is a very small fraction of the total. Insects are typically small to extremely tiny invertebrates and are one of the main members of the arthropod group. The most prominent feature of insects is that their bodies can be divided into three distinct segments: head, thorax, and abdomen. They have six connected legs and usually two pairs of wings attached to the thorax. They evolved during the Silurian period, and by the Carboniferous period, there were large dragonflies with a wingspan of 70 centimeters. Today, insects remain a thriving group, with over one million known species. Insects, like other arthropods, have segmented bodies, main segments on their appendages, and an exoskeleton. Key distinguishing features include: a head with a mouth, no walking limbs, and reproductive openings near the anus; and typically, metamorphosis occurs during development. The world's insect species are estimated to number over 10 million. However, only about 1 million species have been recognized by humans, which is a very small fraction of the total. Insects are typically small to extremely tiny invertebrates and are one of the main members of the arthropod group. The most prominent feature of insects is that their bodies can be divided into three distinct segments: head, thorax, and abdomen. They have six connected legs and usually two pairs of wings attached to the thorax. They evolved during the Silurian period, and by the Carboniferous period, there were large dragonflies with a wingspan of 70 centimeters. Today, insects remain a thriving group, with over one million known species.