Biology
Food Chains
Quick fact
Only about 10% of the energy from one trophic level is passed to the next; the rest is lost as heat, movement, and waste. This is why food chains rarely have more than four or five links.
Why this is interesting
Have you ever wondered why a lion eats a zebra, and the zebra eats grass? That simple chain of eating and being eaten is the invisible highway that moves energy through nature.