What is the type of air mass that forms north of 50 degree north latitude or south of 50 degree south latitude?

The answers is bad germs in their

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

Conservation efforts have been effective in "increasing the number of endangered species, reducing all the negative impacts of human activity, and preserving wildlife habitats".hope my answer has you : ) 

You can find the answer from the answers.com