Which gas is a source of natural groundwater pollution

im thinking its carbon

How can you approximate the number of calories required to keep you in energy balance?

Complete the statements to identify the first two steps of meiosis i. (1 ) the first and longest step of meiosis i is called i. (2)the second step of meiosis i is called i.

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because