The failure of the attempt to reintroduce clapper rails in california was an example of

difficulty of redesigning workable ecosystems

fragility of wetland habitats

lack of cooperation between government agencies

time consuming process of listing endangered species

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.