Answer:
An <em>organism </em>is any individual living thing but the definition of life is not simple because humans determine what meets the criteria of living and nonliving. However, this does not mean that humans are perfect when it comes to categorization. Viruses fall into a middle area between being classified as living or nonliving since viruses have some, but not all, of the characteristics required to be classified as living.
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Trace metals, like iron and magnesium, are considered _Building blocks of molecule__________________, while organic compounds, like vitamins, are considered________Complex Molecule___________
