Well for one, theyre all sharks. All sharks are related in some way, including skates and rays as well.
No it is not small it is one of the biggest coastal sharks in the world.
No. Sand tiger sharks are the "sand shark" which is the same or a subspecies to grey nurse sharks. I reject the reclassification of grey nurses and sand tigers from Odontaspis as Carcharias....
They usually go in an abandon ship or a dark cave.
Are the sandbar shark and the Gummy shark are related yes or no?