Can a shark grow new teeth?
The hungry shark is a toothy animal, and some of the big fellows are always Eager to attack a swimmer. They can tear into human f1esh and bite off arms or legs. Some sharks have several rows of teeth, and when some are lost, there are always new ones ready to replace them. The sea was infested with sharks long before the true fishes arrived. Their family tree dates back more than 300 million years, and they have never developed many of the features we find in the real fishes. A shark, for example, has no bones. Its skeleton is made of gristly cartilage. The shark has other features which set him apart from other animals. And perhaps his most outstanding feature is his teeth. He has several rows of teeth in his mouth, and the most amazing fact is that his whole body is covered with spiky scales which resemble small teeth. The teeth in the shark’s mouth are shaped like little wedges. They are embedded not too firmly in the flesh of the ,jaw. Since they have no firm roots, the shark is fo
