Looking at the bar graph, what does it mean that the total height of the bars is lowering but the purple bars are relatively steady

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.

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.