3.2 biology

• Food chain


  A diagram that represents the flow of energy between organisms
• Flow of energy


  What the arrows represent in a food chain
• Ways energy is lost from a food chain

  • Heat
  • Movement
  • Undigested materials
• Movement is the only way in which energy remains in a food chain
• Pyramid of energy


  A diagram that shows the quantity of energy available at each stage in the food chain
• Pyramid of numbers


  A diagram that shows the number of organisms at each stage in the food chain
• At each level in a food chain, the majority of the energy is lost as heat, movement, and undigested material