Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.

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The desirable characters a farmer looks for in his sugarcane crop is qualities of high yield, thick stems, high sugar and ability to grow in the sugarcane areas of N. India. 

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Secondary treatment of sewage involves biological organism such as aerobic and anaerobic microbes or bacteria and fungi to digest or consume organic waste. Therefore, it is also called biological treatment.

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