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).
Even though all of the chemical elements in a mineral affect its. properties, minerals having similar anions tend to have similar properties. Other than the native elements, the simplest minerals have an. anion that consists of only one element. The anion in halite is known as. the chloride ion.