How many bones do sharks have in their skeletons?

• A. 54
• B. 0
• C. 206
• D. 300

Answer: (B)

Verified step by step guidance

1. Understand that sharks are cartilaginous fish, meaning their skeletons are made of cartilage rather than bone. Cartilage is a flexible, lightweight tissue that is different from the hard, calcified structure of bones.
2. Recall that the term 'bones' refers specifically to calcified structures found in organisms like mammals, birds, and reptiles. Sharks do not have these calcified bones in their skeletons.
3. Identify that the skeleton of a shark is composed entirely of cartilage, which provides structural support and flexibility, allowing them to move efficiently in water.
4. Compare the shark's cartilaginous skeleton to the bony skeletons of other vertebrates, such as humans, who have 206 bones. This highlights the difference in skeletal composition.
5. Conclude that the correct answer to the question is 0, as sharks do not have any bones in their skeletons, only cartilage.