Which is the best example of the organismic phase of the carbon cycle? A cheetah exhales carbon dioxide.
Lightning strikes a telephone pole.
Limestone contains carbon compounds.
Oceans hold stores of carbon dioxide.

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.

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.