Carbon is a key element in many molecules that make up living creatures. The carbon atoms in your body .

A - Were created during the Big Bang
B - Were created when dinosaurs died and were buried by mud
C - Have existed since the beginning of time
D - Were created inside of ancient 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.