Plzz 15 points list the fossils in order from oldest to youngest in the diagram. what can you conclude about
this area based on this fossil record?

What is important to study for nios grade 12 chemistry? i have only one month left.

Lewis structure and molecular geometry for nh2cl

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.