Multicellular organisms undergo cell specialization in order to create organization within the body. which of the following would not be an example of cell specialization?
a. pancreatic cell that produces protein-digesting enzymes.
b. muscle cells that control movement of materials in the body
c. a prokaryotic cell that carries out photosynthesis.
d. a red blood cell that carries oxygen.

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.