The right option is; D Luster
If a mineral has a metallic shine to it, the luster of the mineral is being measured.
Luster is the property of a mineral which describes how the mineral reflects light, and also the dullness or brightness of the mineral. Luster is grouped into two which are; metallic and non-metallic. Minerals with a metallic luster are reflective and opaque. An example is pyrite. Non-metallic luster are also classified into groups based on how much light is reflected. The groups include pearly, dull, waxy, resinous, silky, and vitreous luster.
In humans, pharyngeal slits are presents in the embryo and develop into the the ears
I think that the healthcare common procedure coding system was originally developed for use in coding services, such as durable medical equipment, for Medicare patients. The HCPS is a set of health care procedure codes based on the American Medical Association's Current procedural Terminology.
It involve both experimentation and repeated observations
