Which of the following forms of pollution pose the greatest threat to the delicate balance of life on earth? a. air and water pollution b. soil and land pollution c. wind and granite pollution d. fossil fuel and sun pollution

Bwould be my guess |-/ 

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion