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Any cell-metabolism related waste product can be loosely classified as excreta. But undigested food,which is a part of faecal matter, should not be called as excreta. However, faecal matter contains a very small amount of salts of heavy metals like Mercury,Lead etc. which are produced by cell metabolism. So faecal matter can loosely be classified as excreta.

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Q: Why removal of undigested food is called excretion?
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