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The image shows an example of a soil food web.

Explain the reasons for food chains rarely containing more than four or five trophic levels.

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a	energy is lost between the trophic levels;
b	transfer between levels is only usually 10\% efficient OR energy transformations take place in living organisms / the process is never 100\% efficient;
c	energy is lost by the organism/used in respiration/released as heat/movement;
d	energy is lost as waste/feces/urine/undigested food/uneaten parts;
e	as energy is lost between trophic levels, higher ones have less biomass / less biomass available for the next level;