The cell is the basic unit of structure and function in all living organisms. Tissues are made up of groups of cells with similar characteristics. These cells work together to carry out specific functions. Based on the definitions above and the functions of the three general tissue types, epithelial tissue will contain

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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.