of Earth is composed of nitrogen (about seventy eight%), oxygen (about 21%), argon (approximately 0.Nine%), carbon dioxide (zero.04%) and different gases in trace amounts. Oxygen is used by most organisms for respiration; nitrogen is constant with the aid of micro organism and lightning to produce ammonia used within the production of nucleotides and amino acids; and carbon dioxide is used by plant life, algae and cyanobacteria for photosynthesis. The ecosystem
facilitates to defend residing organisms from genetic damage by solar ultraviolet radiation, solar wind and cosmic rays. The present day composition of the Earth's environment is the manufactured from billions of years of biochemical amendment of the paleoatmosphere by means of living organisms.
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