Insect definition, any animal of the class Insecta, comprising small, air-breathing arthropods having the body divided into three parts (head, thorax, and abdomen), and having three pairs of legs and usually two pairs of wings.
in·sect (ĭn′sĕkt′) n. 1. a. Any of numerous arthropod animals of the class Insecta, having an adult stage characterized by three pairs of legs and a body segmented into ...
Insect: Insect, any member of the class Insecta (Hexapoda), the largest class of phylum Arthropoda, about 1 million species or three-fourths of all animals.
Insect respiration happens without lungs.There is a system of internal tubes and sacs through which gases diffuse or are actively pumped.Air is taken in through openings on the sides of the abdomen called spiracles.
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