A: According to BBC, an endoskeleton is a bone structure located in the interior of an animal, and an exoskeleton is a bone structure located on the exterior of an animal. Each type of skeleton has unique advantages and disadvantages in helping the animal survive.
Minerals made of only one element are called NATIVE minerals (i.e., silver, gold, mercury, copper). Minerals composed of compounds are simply referred to as minerals (i.e., quartz, which is made up on silicon and oxygen).
A mineral is sometimes made up of just one chemical element but more often it is a compound (mixture) of two or more. For example, diamond is made up of just carbon, while fluorite is made up of a compound of calcium and fluorine. There are over 4000 different types of minerals.earn what rocks and minerals are, what the difference is, examples of rocks and minerals, the difference between igneous, sedimentary and metamorphic rocks, Mohs scale of hardness and much more. Read on and have fun finding out about rocks and minerals.