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Internal.
internal
External - Exoskeleton .
internal
By definition, arthropod skeletons are external, a defining characteristic of the phylum; having both an internal and external skeleton would be redundant.
Arthropods use external skeletons (exoskeletons).
No beetles have an exoskeleton or external skeleton not an internal skeleton (bones).
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The EXO-skeleton protects from OUTSIDE factors of danger,such as predators,weather,etc. While the ENDO-skeleton protects the organs of the animal..
Skeletons:All animals, including humans have skeletons. Humans have an internal skeleton. This means that our bones is on the inside of us. When an animal has an external skeleton it means that their skeleton is on the outside. These animals who have an external skeleton have what we commonly call shells. These shells are their skeleton which keeps their insides together. If you think of one of those big crabs and how there is a shell on the outside of them (not sea shells) this is their skeleton which is an external skeleton.
A cephalopod is a mollusk and an invertebrate; it has no skeleton neither external nor internal.
Nothing has an external backbone. Some creature have an exoskeleton.A beaver is a mammal and as such is a vertebrate with an internal skeleton.