Passage Summary: We find plenty of old shark teeth, but almost never find their full skeletons, which is weird compared to other animals.

Reasoning: While fossilized shark teeth are found in great abundance, fossilized shark skeletons are extremely rare compared to other vertebrates.

Analysis: The paradox lies in the discrepancy between the preservation of one body part (teeth) and the rest of the body (the skeleton). To resolve this, we need a piece of information that explains why teeth are more likely to survive the fossilization process than shark bones. Since sharks are known for having skeletons made of cartilage rather than hard bone, look for an answer that highlights how cartilage decomposes much faster or fossilizes much less readily than teeth do.