Insects
Insects
Insects are neumerout invertebrate animals that belong in the Phylum Arthropoda
and Class Insecta. The class Insecta is divided into 2 subclasses: Apterygota,
or wingless insects, and Pterygota, or winged insects. Subclass Pterygota is
futher divided on basis of metamorphosis. Insects that have undergone incomplete
metamorphosis are the Exopterygota. Insects that undergo complete metamorphosis
are the Endopterygota.
Insects have an outer bilateral exoskeleton to which the muscles are attached
to and provides protection for internal organs. The body is divided into 3 main
parts which are the head, which include mouthparts, eyes, and antennae; thorax,
which operate the jointed legs and /or wings; and abdomen, which has organs for
digested food, reproducing, and getting rid of waste products.
The major systems in insects are the circulatory, respiratory, nervous,
muscular, digestive, and reproductive systems. In the circulatory system, blood
is pumped by the heart in a......
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