Answer
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Hint: Nitrogen is important for both plants and animals for their development, and it makes about $70-80\%$ of the environment. The plant takes nitrogen by fertilizers mainly whereas the animal takes nitrogen from plant sources which help to make protein from amino acids in the animal body.
Complete answer:
Breathing takes place by atmospheric air, the atmosphere of our environment consists of $70-80\%$ nitrogen and $20\%$ oxygen with some other gases. The oxygen which inhales by human gets bind with the haemoglobin in our blood whereas nitrogen does not get bind with blood because it does not have nitrogen binding protein complex to bind the nitrogen, therefore, humans are unable to inhale nitrogen, and also because it consists of the triple bond which is very unreactive nitrogen is unable to break after breathing. Nitrogen alone is harmful to breathing whereas when it gets mixed with other gases it becomes suitable for breathing. As nitrogen is important for both plants and animals for its development, plants take nitrogen mainly from fertilizers which help in its development and the nitrogen present in the plant gets consumed by the animal which helps in making amino acids which later makes the protein. The ultimate source of nitrogen for the human body is the plant and its products. Nitrogen helps to make DNA and RNA and is also helpful in the development of embryos therefore it is very important. So, humans are unable to inhale nitrogen.
Note:
The nitrogen cycle helps in the fixation of the demand for nitrogen in the atmosphere. The nitrogen gets broken down into different products, which get used up and later form nitrogen by the process of nitrification. Denitrification, putrefaction get mixed with the atmosphere and the nitrogen cycle continues.
Complete answer:
Breathing takes place by atmospheric air, the atmosphere of our environment consists of $70-80\%$ nitrogen and $20\%$ oxygen with some other gases. The oxygen which inhales by human gets bind with the haemoglobin in our blood whereas nitrogen does not get bind with blood because it does not have nitrogen binding protein complex to bind the nitrogen, therefore, humans are unable to inhale nitrogen, and also because it consists of the triple bond which is very unreactive nitrogen is unable to break after breathing. Nitrogen alone is harmful to breathing whereas when it gets mixed with other gases it becomes suitable for breathing. As nitrogen is important for both plants and animals for its development, plants take nitrogen mainly from fertilizers which help in its development and the nitrogen present in the plant gets consumed by the animal which helps in making amino acids which later makes the protein. The ultimate source of nitrogen for the human body is the plant and its products. Nitrogen helps to make DNA and RNA and is also helpful in the development of embryos therefore it is very important. So, humans are unable to inhale nitrogen.
Note:
The nitrogen cycle helps in the fixation of the demand for nitrogen in the atmosphere. The nitrogen gets broken down into different products, which get used up and later form nitrogen by the process of nitrification. Denitrification, putrefaction get mixed with the atmosphere and the nitrogen cycle continues.
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