17. The Hertzsprung-Russell diagram below shows how the brightness, surface temperature, and color of stars are related.
Hertzsprung-Russell Diagram
Blue
10,000 suns
Supergiants
Red
100 suns
Brightness
White
Giants
o
Main-sequence
stars
o
o
OO
0
o
1 sun
Yellow
Orange
0.01 sun
White dwarfs
оо
Red
50,000 25,000 11,000 7,800 6,300 5,300 3,800
Surface Temperature (K)
Barnard's Star
Which of these observations of Barnard's Star is most likely accurate?

they are both synthetic elements

explanation:

d

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).