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Which is not a required characteristic of life?
Urea
A waste product formed in the liver, the final nitrogenous excretion product of protein metabolism, which is excreted in the urine.
Accompanying Figure
A visual element, such as a graph, chart, or diagram, provided alongside a text or publication to illustrate or clarify the information presented.
Primary Nitrogenous Waste
The main form of nitrogen-containing waste products excreted by living organisms, varying among species (e.g., urea, ammonia, uric acid).
Amphibians
A class of cold-blooded vertebrates that includes frogs, toads, newts, and salamanders, characterized by their life cycle stages both in water and on land.
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