Question

this diagram is a model of a horses skeletal system.
complete the sentence.
a horses skeletal system includes an ______.
endoskeleton exoskeleton

Explanation:

Horses are vertebrates, and vertebrates have an endoskeleton (internal skeleton) made of bones, while exoskeletons are external (like in insects). The diagram shows the internal skeletal structure of the horse, so the correct term is endoskeleton.

Answer:

endoskeleton