Aparticular air mass contains extremely cold, dry air. based on this information, how would this air mass most likely be classified?

Air mass that have extremely cold and dry air is been classified as Arctic air mass. Arctic air mass can be found in Greenland and Antarctica. Polar air mass is not extremely cold and is found in Canada, Pacific ocean etc.

Equatorial air mass is warm and very moist and can be found in Equatorial region. Tropical air mass is warm and not humid and can be found in Mexico. Air mass plays an important role in controlling the weather significantly.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.