PLEASE HELP IM BEGGING I wILL GIVe BRAINLIEST HEEELLLP

the answer would be streak C.)

Explanation:

The reason for this is because color, luster, and hardness are all very similar, however they have a very different streak so thats how you would tell the difference between them.    

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.