An element that the main component of atmospheric air and plays an important role in any ecosystem: this is needed by all organisms to form proteins, atp, and nucleic acids.

The answer is nitrogen. It comprises approximately 78% of the atmospheric air. Nitrogen can be found in most life processes including as a component of amino acids –amino group (NH3-). It is also involved in the structure of nucleosides that are critical in the formation of nucleotides and ATP.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.