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the domain that contains prokaryotic micro-organisms. Some live in extreme environments, such as hotsprings. Because of some similarities with eukaryotes the Archaea are more likely to be the ancestors of eukaryotes than the Eubacteria.
the nerve cells that transmit nerve impulses towards the central nervous system from the...
the seepage of acidic, contaminated water from disused mines and mine dumps.
the blood circuit from the heart to the body and back to the heart.