Cells exchange materials with the environment around them because they get rid of wastes and take in nutrients. Thus, the correct option is D.
A Cellular exchange may be defined as the process through which waste products and other toxins within muscles are interchanged with healthy nutrients and oxygen.
When the biological process of cellular exchange increases, muscles become healthier and stronger as compared to normal and are less likely to cause abnormal circumstances like fatigue and weakening.
Therefore, the main reason for the cellular exchange is to get rid of waste and take in nutrients. Thus, the correct option is D.
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