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Question

In what forms oxygen is supplied for humans
 


Solution

 

We breathe O2 because it is need to liberate/produce energy in our body.

We need energy to live and this energy is provided by the food we it. Although the food that we eat might not be in the form which can be used by our cells to produce energy. Therefore, they are broken down into simple substances before they can be utilised to produce energy. This is done through a process called Respiration.

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