The percentage of Nitrogen gas in the atmophere is: , 90%, 78%, 10%, 2%, Most organims can not use nitrogen gas directly , True , Flase , The process of converting Nitrogen gas into Ammonia comound is known as , Nitrogen convesion , Nitrogen fixation , Nitrogen changing , Nitrogen traping , Nitrogen fixing bacteria change Nitrogen gas to , Ammonia , Sugar , Salt , water , Nitrogen fixing bacterial is found in, Both soil and roots of some plants such as peas and legumes only  , Soil only , Both a and b , Air , lightning fix very small amounts of gasous nitrogen, we call this , lightning nitrogen fixation , atmospheric nitrogen fixation , The form of nitrogen that can be used by primary producers (plants) is , Nitrate (NO3-) and Nitrite (NO2- ) ions , Ammonia , Ammonia is converted to nitrates and nitrites, two forms that can be used by plants by , Other type of bacteria , sun light , Decomposition , Photosynthesis , The nitrogen found in the bodies of animals is released by , Decompostion , when animals gets rid of wastes , both a and b , The process by which Nitrates ( NO3- ) is converted to nitrogen gas is known as , denitrificaiton , decomposition , Conversion , Nitrogen in livingthings is found in , Proteins ( e.g muscles, hair), DNA and RNA, Both a and b , There only way consumers can get nitrogen is by eating plants , Flase , True .

Nitrogen cycle

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