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Insecta, also known as insects, are a class within the phylum Arthropoda. They are characterized by their segmented bodies, jointed limbs, and exoskeletons made of chitin. Insects have three main body segments: the head, thorax, and abdomen. They typically have one pair of antennae on their heads, used for sensing their environment, and three pairs of legs attached to the thorax. Many insects also have wings, though not all do. Insects are a diverse group, with over a million described species and likely many more yet to be discovered. They can be found in nearly every habitat on Earth, from the tropics to the poles, and at altitudes ranging from sea level to the tops of mountains. Insects play important roles in ecosystems as pollinators, decomposers, and prey for other animals. Despite their small size, insects have complex behaviors and social structures. Some, like bees and ants, live in colonies with divided labor, while others, like butterflies and moths, undergo complete metamorphosis during their life cycles. Insects also have a wide range of sensory abilities, including the ability to see, hear, taste, and smell. Insecta is a vast and fascinating category of animals that has captured the interest of scientists and hobbyists alike for centuries. From their intricate structures to their diverse behaviors, insects are a testament to the incredible complexity and beauty of life on Earth.