Insects are arthropods (a type of invertebrate, animals that lack a backbone). All insects have a hard exoskeleton, a three-part body (head, thorax, and abdomen), three pairs of jointed legs, compound eyes, and two antennae. The legs (and wings, if applicable) are attached to the thorax. Insects breathe through holes called spiracles. Insects hatch from eggs. Insect means “segmented” in Latin. There are about a million different types of insects and many more that have not been discovered yet. Insects (Class Insecta) are currently divided
into 31 orders.
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