• Describe genetic and gene as mechanisms of evolution.

genetic is branch of science deal with study of heredity and genes

genes is segment of DNA which transfer parental character from one generation to another

i think this picture will you.

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.