Invertebrates belonging to the class Insecta are known as Insects (from the Latin insectum).
Insects can be found in almost all environments, though only some are particularly conducive to their growth.
Insects have a three part body (head, thorax, and abdomen),
three pairs of jointed legs, complex eyes, and one pair of antennae in addition to a chitinous exoskeleton.
Their blood is not entirely enclosed in vessels; some of it flows in the haemocoel, an exposed cavity.
Insects are the most diverse group of animals; they include more than a million described
species and account for more than half of all known living things.
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