Which of these is NOT maintained in a balanced state by the human body?

D, the answer is letter d. because even though fossil fuels take a very long time to form, they do form in the ground just like coal and others.

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

Answeraquifer;