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 rock is a naturally occurring solid it is made of minerals which are crystalline or other mineral like substances the minerals in the rocks vary making different kinds of rock see the fact file below for more information about rocks and mineralst is made of minerals which are crystalline or other mineral like substances the minerals in the rocks vary making different kinds of rock see the fact file below for more information about rocks and minerals