ANSWERS: 3
  • Fire water wind earth
  • Oxygen, carbon, hydrogen and nitrogen http://www.helium.com/items/504931-oxygen-carbon-hydrogen-nitrogen
  • 1) "Among the 87 known elements less than one-half (namely 34) have been found to enter into living matter. Of these only 17 seem to be essential to life, and of these 17 not more than 4 elements form from 97 to 99 per cent of the living organism." Source and further information: http://www.jgp.org/cgi/reprint/1/4/429.pdf In this reference, following information can also be found: - Fig. 1: the main bioelements are in the order of importance: Oxygen, Carbon, Hydrogen, Nitrogen. - Table 1: the main bioelement in the human body are, with percentages: Oxygen: 62.43 Carbon: 21.15 Hydrogen: 9.86 Nitrogen: 3.10 - Table 1: the main bioelement in the long leaf pine are, with percentages: Carbon: 53.96 Oxygen: 38.65 Hydrogen: 7.13 Aluminium: 0.065 2) "Carbon forms the backbone of biology for all life on Earth. Complex molecules are made up of carbon bonded with other elements, especially oxygen, hydrogen and nitrogen. It is these elements that living organisms need, among others, and carbon is able to bond with all of these because of its four valence electrons. Since no life has been observed that is not carbon-based, it is sometimes assumed in astrobiology that life elsewhere in the universe will also be carbon-based. This assumption is referred to by critics as carbon chauvinism, as it may be possible for life to form that is not based on carbon, even though it has never been observed." Source and further information: http://en.wikipedia.org/wiki/Carbon-based_life 3) "Alternative biochemistry is the speculative biochemistry of alien life forms that differ radically from those on Earth. It includes biochemistries that use elements other than carbon to construct primary cellular structures and/or use solvents besides water. Theories about extraterrestrial life based on alternative biochemistries are common in science fiction." Source and further information: http://en.wikipedia.org/wiki/Alternative_biochemistry

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