Water is the main solvent of the living beings
and it is necessary practically for all biochemical reactions,
including as reagent of photosynthesis.There are several properties
of water that are very important for life.
Carbon is the main chemical element of organic
molecules.Carbon dioxide is also reagent of photosynthesis and
product of the energetic metabolism of the living beings.
Nitrogen is a fundamental chemical element of
amino acids, the building blocks of proteins that in their turn are
the main functional molecules of the living beings.Nitrogen is also
part of the nucleic acid molecules, the basis of reproduction,
heredity, and protein synthesis.