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yes
Yes, flies have exoskeletons. Flies are arthropods and all arthropods have an exoskeleton. More than 90% of creatures on earth are arthropods.
Arthropods
A proposal exists that a couple organisms discovered just before the Cambrian period about 555 million years ago were the first arthropods found in the fossil record; by about 530 million years ago trilobites already showed significant diversity and world-wide distribution. There have been multiple mass extinctions inferred from evidence; but basically they've continuously occupied the Earth since.
arthropods
When its probability distribution the standard normal distribution.
I'm going to say....spiders...arachnids
balls
They express the characteristics inherent to arthropods. All insects are arthropods. Not all arthropods are insects.
Arthropods ( EARTH SCIENCE )
Almost two-thirds of all named species of animals on Earth are arthropods. Arthropods are animals like crustaceans, spiders, and insects.
NO Mammals are not arthropods. Arthropods are insects.