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You asked:

is a flea an arthropod

Yes. A Siphonaptera is an arthropod.
Siphonaptera
Siphonaptera
Siphonaptera

Flea, a common name for any of the small wingless insects of the order Siphonaptera

arthropod
arthropod
arthropod

arthropod (invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin)