Answer: Sharks compare how long it takes to reach each of their nostrils to determine the direction of a smell. This is called the "bimodal flow" system. The nostrils are located on the underside of the shark's snout, and they are connected to the olfactory bulb in the shark's brain. The olfactory bulb is responsible for processing smells.
When a shark smells something, the odor molecules travel through the nostrils and into the olfactory bulb. The olfactory bulb then sends signals to the shark's brain, which tells the shark the direction of the smell. The shark can then turn towards the smell and follow it.
The bimodal flow system is very accurate. Sharks can use it to detect smells that are very faint. They can also use it to detect smells that are coming from different directions. This makes the bimodal flow system a very important tool for sharks. It helps them to find food and to avoid predators.
The hammerhead shark's wide nose helps it to use the bimodal flow system even more effectively. The wide nose allows the shark to take in more odor molecules, which makes it easier for the shark to detect smells. The wide nose also helps the shark to determine the direction of a smell more accurately.
The hammerhead shark is not the only shark that uses the bimodal flow system. Other sharks, such as the nurse shark and the lemon shark, also use this system. However, the hammerhead shark is the most well-known shark that uses the bimodal flow system.
Step-by-step explanation: