In the practice of science, how is the accuracy of a scientific claim evaluated?
by carefully gathering and analyzing a variety of opinions from the public
by testing the claim's predictions in a controlled setting
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by critically considering alternative scientific claims or explanations
by repeating the experiments that led to the claim being made
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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.

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