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).
Minerals are made of chemicals - either a single chemical or a combination of chemicals.There are 103 known chemical elements. Minerals are sorted into 8 groups. Difference between rock and mineral- A rock is made up of 2 or more minerals, whereas a mineral is composed of the same substance throughout. Ore- A mineral occurring in sufficient quantity and containing enough metal to permit its recovery and extraction at a profit.