What limits the length of each food chain in an ecosystem?

Living organisms, eating representatives of the previous level, receive energy stored in its cells and tissues. A significant part of this energy (up to 90%) is spent on movement, breathing, heating the body, etc. and only 10% accumulates in its body the form of proteins (muscles), fats (adipose tissue). Thus, only 10% of the energy accumulated by the previous level is transferred to the next level. That is why food chains cannot be very long.

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