How are useless remnants from catabolism separated?

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Homework Statement


The useless remnant that are produced from substances catabolism are separated by:
rectum
exhalation
excretory system
rectum and excretory system

Homework Equations

The Attempt at a Solution


I think it is the last, but it may also be the second because we have the burnt of glucose.
 
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Very strange question. Is this the exact wording?

In particular, the use of the word 'separated'. I would have expected 'removed', 'expelled' or 'emitted'.