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a clear, colourless, odourless and tasteless liquid that can also occur as a gas (water vapour) and solid (ice). Water is known as the universal solvent and is essential to life on Earth.
any disease that is caused by a virus or a bacterium or any other micro-organism.
a state in which the body has become dependent on a chemical substance in order to function.
a molecule that stores large amounts of energy that can be used for metabolic activity.
the complete set of alleles (different forms of genes) making up the genetic material of a...