A virus is arguably alive, and is not a cell, but it depends on infecting a cell in order to reproduce.†May also notes that it is possible that half the extant species on the planet may become extinct in the next 50 to 100 years. HUNTER 15 18 ARTIFICIAL INTELLIGENCE & MOLECULAR BIOLOGY*kcal is an abbreviation for kilocalorie, the amount of energy necessary to raise a liter of water one degree centigrade at standard temperature and pressure.It is equivalent to 1 dieter's calorie.A mole is an amount of a substance, measured in terms of the number of molecules, rather than by its mass.One mole is 6 x 10 23 molecules.
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A 1994 study studied this question.