Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How is a pyramid or number arranged?
   • A pyramid of numbers shows how many organisms are consumed at each stage (trophic level) of a food web. Generally, there are more organisms consumed at earlier stages. This is because most of the Energy consumed is used for movement or staying warm. Little is used to build body mass.
2. What is bioaccumulation and what levels of the food chain will it affect the most?
   • Organisms on low levels of the food web can ingest small amounts of toxic materials and survive. When multiple low level organisms are ingested by higher level organisms the toxic materials accumulate to levels that are dangerous. This is called bioaccumulation.