Biologists define life by metabolism and growth.
Two essential items that biologists agree are necessary to consider an organism "alive" are metabolism and growth.
Metabolism involves taking in energy and nutrients to use for various biological processes. For example, a car battery, though non-living, can store and release energy similar to how living organisms utilize energy.
Growth refers to an increase in size or complexity. While crystals may form and 'grow' in size, they lack the ability to reproduce or respond to stimuli like living organisms do.
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