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One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.
of, or relating to logical induction
A tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same column.
A system allowing hardware and software from different manufacturers to be used together seamlessly.
A genus of unicellular protozoa that moves by means of temporary projections called pseudopodia.
The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794.
caused mainly by atmospheric pollution with sulphur dioxide and nitrogen compounds.
The branch of biology dealing with the relationships of organisms with their environment and with each other.