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Decay is the process in which nutrients taken in by an organism during its lifetime is returned/recycled back
to the environment. If decay did not occur then e.g. dead animals would build up everywhere which would
cause a horrible scent and possibly increase spread of disease

Decay begins as soon…

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Why are there holes in the filter tank?
As some decomposers e.g. Bacteria need oxygen in order to work. These holes provide oxygen for the
bacteria to respire aerobically and produce energy which can be used to break down remaining waste.


Why can the waste be used for fertilisers?
As…

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