The respiration process In the inhalation process, we take oxygen gas, but in exhalation process, we expel carbon dioxide gas and the water vapor, so, the respiration process includes two processes which are the...
The human respiratory system We can not live without the air, It contains oxygen gas which burns the small particles of the digested food to produce the energy, carbon dioxide gas and the water...
The excretory materials The excretory materials are carbon dioxide, nitrogenous wastes, excess salts and excess water, They are the waste materials which produced inside the cells and the body must get rid of them.
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