yes
Yes, they do in deed. It's just like how us, humans, also have internal skeletons. Therefore, internal skeletons have bones.
Orangutans are mammals who have internal skeletons.
No.
Insects do not have internal skeletons, the have Exo-Skeletons.
Their skeletons tend to be on the outside
Internal skeletons are structural systems found inside the bodies of animals, providing support and protection for their organs. These skeletons can be made of bone (as in mammals), cartilage (as in sharks), or a combination of both. Internal skeletons allow for greater flexibility and movement compared to external skeletons like shells or exoskeletons.
No plants have internal skeletons
Yes.
NO - it has an internal skeleton !
No they are made of cartilage
External
Echinoderms have internal skeletons.