Hydrogen bonds form A. to hold one molecule of water together, bonding one hydrogen atom and two oxygen atoms
B. To hold one molecule of water together bonding one oxygen atom and two hydrogen atoms
C. between the positivity charged oxygen of one water molecule and the negatively charged hydrogen of another water molecule
D between the negatively charged oxygen of one water molecule and a positively charged hydrogen of another water molecule

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explanation:

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.