They help convert nitrogen to nitrate which is usable by living beings. (Living beings can't use regular nitrogen)
A, B, and C. Luster is the light and how light reflects off of it, right?
So, in that case, a non metallic mineral, (think coal) wouldn’t shine much. A metallic mineral would shine, because it’s metal. And something that’s shiny obviously shines.
Go with A B and C.
The worm is the decomposer. Decomposers break down dead matter and gives room for new life to thrive.
