Where do seashells come from?
Seashells are the external skeletons of a class of marine animals called Mollusks. Where people have our skeletons on the inside of our bodies, mollusks have their skeletons on the outside of theirs. This way they help protect the creatures from predators, strong currents and storms, help camouflage the animal, and do many other things. Seashells are primarily made of calcium, a hard mineral, just as our own bones are. Click here for the rest… I’ve read that seawater is chemically similar to blood — is that true? Actually, it is! It’s even been used in transfusions in emergency situations when blood or plasma wasn’t available and the patient needed to have his blood volume maintained. In an early experiment a dog had its entire blood supply replaced with seawater, and it seemed to do fine while its body replaced it with new blood. Click here for the rest… Do sharks have skeletons like people do? You’d think so, but they don’t, really. While many types of fish have skeletons made o
