speech on atmosphere for class 7 pls give me the answer fast
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The atmosphere of Earth is composed of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%) with carbon dioxide and other gases in trace amounts. Oxygen is used by most organisms for respiration; nitrogen is fixed by bacteria and lightning to produce ammonia used in the construction of nucleotides and amino acids; and carbon dioxide is used by plants, algae and cyanobacteria for photosynthesis. The atmosphere helps to protect living organisms from genetic damage by solar ultravioletradiation, solar wind and cosmic rays. The current composition of the Earth's atmosphere is the product of billions of years of biochemical modification of the paleoatmosphere by living organisms.
kaushik866:
thanks for this answer
You are most welcome
आप ओर information दे सकते हो क्योंकि मुझे कम से कम 2 पेज speech learn करने को कहा है।
और please जलदी मुझे आज ही चाहिए।
अब मुझे नही चाहिए मुझे मिल गया।
ohk
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