What is one reason that abiotic factors are important in an ecosystem? A. They provide necessary nutrients to the organisms.
B. They provide cold weather for organisms to thrive.
C. They provide food directly to all organisms in an ecosystem.
D. They provide the renewable resources that humans need.

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.

What type of context clue you understand the meaning of  quandary?

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.