Sharks are strange because their skeletons are not made up of ......... like humans. Rather, they are made up of cartilage.

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Sharks are strange because their skeletons are not made up of ......... like humans. Rather, they are made up of cartilage. (*) lungs (*) bones (*) eyes (*) lips

This is a companion discussion topic for the original entry at https://english.best/questions/2579,sharks-are-strange-because-their-skeletons-are-not-made-up-of-___-like-humans-rather-they-are-made-up-of-cartilage/