The burning of fossil fuels by cars and factories has most affected the cycle.
a) carbon
b) hydrogen
c) nitrogen
d) water

the answer for this question would be d. glaciers

not only is it colder, it also becomes darker, less salty, and more dense.

not: both offer magnification to the atomic level.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.