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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.
a method of ordering the age of different fossils, relative to each other, without working out...
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...
a fine thread-like structure. In plants: the stalk of the male sexual organ.