Life, in scientific terms, can be defined as manifestation of several distinguishing characteristics. Some such distinguishing features of living beings typically include, ability to grow, reproduce, carry out metabolism, adapt to changing conditions, etc. Life forms are generally carbon-based and have evolved over the last couple of billion years on Earth. Life is manifested, in the simplest form, in the form of cells. Complex life forms are made up of a large number of cells and such examples include, human beings, plants, large animals, fishes, etc. Life can be distinguished from non-living things, in terms of inability to carry out life processes. For example, a piece of rock cannot reproduce or grow (on its own) or adapt to the environmental changes or carry out metabolic processes.
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