7. Consider the idea of density-dependent factors that cause stress to ecosystems. Which of the following is not a density-dependent factor that causes stress to an ecosystem?

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

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.