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the widespread and rapid extinction of species in the present age due to negative human impact on the environment.
small units of DNA that contain hereditary information that is passed from one generation to the...
outgrowths of neurons (nerve cells) that transmit nerve impulses towards the cell body.
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
the immunity an organism develops during its lifetime.
a ranking system.