energy flow

• food chains

  energy flowing from one organism to another
• food webs

  where organisms obtain food from more than one food resource, it is in a web-like structure
• trophic levels 


  green plants are the first trophic level since they can manufacture their own food and have a lot of energy
• herbivores will make up the second part of the food chain since they eat plants
• carnivores that feed on herbivores make up the third trophic level.
• top carnivores that feed on other carnivores make up the fourth level.
• omnivores can belong to the 3rd or 2nd trophic level depending on what they feed on
• decomposers can occur at any level depending on what organism they are breaking down
• organisms lose energy during activities such as heat energy will be wasted during excretion or urination and some energy will be lost during feeding