Yes.
No. Insects are the the subphylum hexapoda and millipedes are in myriapoda.
Houseflies belong to the subphylum Hexapoda within the phylum Arthropoda. Hexapoda is a diverse and highly successful group of organisms that includes insects. This subphylum is characterized by having six legs, which is a defining feature of insects. Houseflies are a common example of insects and are part of the order Diptera, which includes flies and mosquitoes.
Actually centipedes are not insects at all. Centipedes belong to the subphylum Myriapoda while insects are in the subphylum Hexapoda.
Insecta (the insects) are the only invertebrates to have flight capability, found under subphylum Hexapoda below the arthropods (phylum Arthropoda). Winged insects are under subclass Pterygota.
Arthropods are divided into three subphyla: Chelicerata, Myriapoda, and Pancrustacea (which includes Crustacea and Hexapoda). Each subphylum represents a distinct group of arthropods with specific characteristics and differences in body structure and function.
Under phylum Arthropoda are several subphyla including subphylum Hexapoda which contains class Insecta (the insects); and Myriapoda which contains class Chilipoda (the centipedes) and class Diplopoda (the millipedes).
Kangaroos and Fish are both in the Phylum Chodata and Subphylum Vertebrata. The Grasshopper belongs to the Phylum Arthropoda and Subphylum Hexapoda. Anything that is not categorized in the Phylum Chordata and Subphylum Vertebrata is considered an invertebrate In short, the grasshopper is the invertebrate
Butterflies belong to the Animalia kingdom. They also belong to the phylum arthropoda and also belong to the suborder rhopalocera.
The subphylum of millipedes and centipedes belong to the subphylum myriapoda. There are over 13,000 species that are terrestrial and they belong to the Animalia kingdom.
Under the arthropoda phylum are subphyla Chelicerata, Myriapoda, Crustacea, and Hexapoda. (There is also an extinct class Marrellomorpha and an the extinct Trilobite subphylum). The chelicerata include spiders, scorpions, mites, etc. Myriapods include centipedes and millipedes. Crustaceans include lobsters, krill, crabs, shrimp, woodlice, etc. Hexapoda include the class Insecta, the insects.
A decapod is part of the subphylum Crustacea (which is part of Arthropods).
Myriapoda