Which of the following is the most accurate description of all known spaces? A. The galaxy contains thousands of universes, and each universe contains millions of stars.
B. The universe contains hundreds of galaxies, and each galaxy contains thousands of stars.
C. The galaxy contains hundreds of universes, and each universe contains thousands of stars.
D. The universe contains billions of galaxies, and each galaxy contains billions of stars.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.