Hi Melissa! I was wondering, what do bull shark teeth look like?
These are what bull shark teeth look like: they're triangular, serrated and very sharp! Look at the pointy tip!
Like other sharks, bull sharks also have multiple rows of teeth. It's on a conveyor-belt like system, where teeth will take the place of broken or fallen teeth.
can you explain why some sharks species are able to survive in both fresh rivers and salt water. Thank you.
Before we talk about how this shark can survive both fresh and salt water, I’ll throw a vocabulary word at you: osmoregulation. Osmoregulation is when an organism, like a shark, can maintain a constant concentration of water in its body though its surrounding environment would cause it to gain/lose water. This is something freshwater and saltwater fish do.
Usually a fish can only do one- either gain or lose water- but the bull shark can change that process so it can both gain AND lose water, depending on whether it’s in salt or fresh water. Usually, if an animal is in salt water, it will keep water in its body and get rid of extra saltiness; if it’s in fresh water, it will lose water to its surrounding environment (so, the water it’s swimming in).
There are more than 30 species of shark or ray that spend some or all of their time in fresh water. Some sharks cannot survive in fresh water because they are not capable of adapting to it. But, bull sharks are unusual because they can adapt readily to fresh water because they can adapt their process of osmogregulation. The kidneys of bull sharks, (and several other types of sharks) can be gradually adjusted to suit the salinity of the water they are in. When moved gradually into freshwater, bull sharks' kidney's remove less salt and more urea from the bloodstream through urination, essentially reversing the normal marine shark method of osmoregulation. This adaptation allows bull sharks to live entirely in estuaries or freshwater.