It can help determine the quelity and safety of water. This can be a good deciding factor of choosing between tap vs bottled water. If the rating is too bad you should choose to use bottled water
The term that refers to all areas of Earth where all life exists is call the Biosphere
321mL times 6 equals to 1926mL
1926mL in Liters is 1.926L
After the star's outer layers are expelled, the density of the remaining material is typically too low to provide adequate energy to sustain the hydrogen-burning shell's nuclear temperatures, and the remaining star easily contracts to form a white dwarf (a star with a density equal to the Sun, but a diameter equal to the Sun).
I think it’s the first but I am not for sure take a guess