6. What is the largest internal organ? Explain its function

The largest organ in the Dogfish is the liver. The shark lacks flotation bladders and that is why most sharks will sink if they stop moving. The liver contains an oil, called squaleen, which helps to float sharks. The sharks stomach can be turned inside out if the shark swallows something it cannot digest. Male sharks have a pair of claspers that are formed from the inner pelvic fins. I will get into further detail on shark reproduction later. The shark's brain is similar in weight to those of birds and mammals making the shark the most intelligent of fish. Sharks can even be
trained. The olfactory bulb is close to the front part of the brain.