food chains

• 1. producer - start of a food chain. produces glucose through photosynthesis
  2. primary consumer - eats a producer. prey of secondary consumer
  3. secondary consumer - eats a primary consumer. predator of primary consumer
  4. tertiary consumer - predates on secondary consumer
• predator-prey cycles

  1. the population of the prey increases
  2. more food is available for the predators, so their population increases
  3. there are more predators so the population of the prey decreases
  4. there is less prey to feed on so the population of predators decreases
  5. the cycle restarts from the beginning