Answer: Pia mater. The pia mater (Latin: tender mother) is a very delicate membrane. It is the meningeal envelope that firmly adheres to the surface of the brain and spinal cord, following all of the brain's contours
Explanation:
<span>I've matched it like this, check it out:
slate - shale
sandstone - quartzite
coal - graphite
limestone - marble
I hope it helps.</span>
Scientists are uncertain whether VANADIUM is an essential minerals for humans.
Scientists have not been able to come to an agreement about the status of vanadium as an essential trace element in human nutrients. Previous studies have submitted that vanadium play some role in hormone, cholesterol and blood sugar metabolism.