Do sharks have skeletons like people do?
You’d think so, but they don’t, really. While many types of fish have skeletons made of bone very similar to our own skeletons — made of calcium and other hard minerals — sharks don’t. Most of a shark’s “skeleton” is actually made of cartilage, a soft, flexible material. Cartilage is the material found in the tips of our own noses, for example. Having a “skeleton” made of cartilage makes sharks more flexible and maneuverable, which helps them catch their prey. Click here for the rest… Some seashells have holes drilled in them — who put them there? Well, it’s not really “who” put them there, but “what.” The holes were made by predators who drilled or chipped their way through the shell to get at the animal inside. Sometimes it’s done by starfish, or other mollusks, or even octopi. Some predators have mouth and beak parts that are specially adapted to bore through a mollusk’s shell. Or they use enzymes to dissolve their way through the shell to reach the meal inside. Picking up seas
