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Arthropoda do not have a backbone or a centralized nervous system. They also do not have lungs for breathing.
Insects are animals, so they belong to the kingdom Animalia.
Animals with a segmented body plan belong to the phyla Arthropoda, Annelida, and Chordata. Segmentation involves the repetition of body units along the length of the organism, which can be seen in arthropods with their jointed limbs, annelids with their repeated segments, and chordates during embryonic development.
Insects belong to the phylum Arthropoda. This phylum includes animals with jointed legs and segmented bodies, such as insects, spiders, and crustaceans.
Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Diptera
The phylum of a black widow spider is Arthropoda.