Food Chains and Webs

• what do food chains show us?

  The feeding relationships in a community
• What is a producer

  An organism that produces its own food, usually a green plant
• What is The primary consumer always?

  Herbivore
• what do the arrows show?

  Energy flow
• Pyramids of number

  These are more useful than food chains as they show how many organisms are at each tropic level by the width of the blocks. Producers are always at the first block at the bottom
• Pyramids of number

  Can have very strange shapes. Heights are always the same. The width is the important measurement and represents number of organisms