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 solid materials of Earthâs crust. Minerals are made of chemical elements. Some minerals are made of one element (atom). Each kind of atom is represented by a symbol. Gold (Au), silver (Ag), copper (Cu), and carbon(C) are minerals made of one element. Most minerals are chemical compounds. Chemical