4.7 Explain why only about 10% of energy is transferred from one trophic level to the next.

• Some energy is used at the current trophic level in life processes
• Some food the organism takes up is undigested and passed as faeces
• Organism might not eat everything (i.e. a rabbit won't eat a cabbage's roots, so won't gain 100% of its energy even if no energy was used by the cabbage)