Trophic levels

• Trophic levels - different levels in a food chain
• Biomass - mass of living material
• Tropic level 1 - Producer

  Tropic level 2 - primary consumer

  Tropic level 3 - secondary consumer

  Tropic level 4 - tertiary consumer
• Reasons why biomass decreases up the pyramid:

  1. organisms dont eat every part
  2. Bits may not get absorbed
  3. Most nutrients used to respire