This teacher playlist demonstrates the Matter Cycling & Photosynthesis unit investigations where the students investigate the idea that all food comes from plants.

This student playlist demonstrates the Matter Cycling & Photosynthesis unit investigations where the students investigate the idea that all food comes from plants.

This lesson will introduce energy pyramids, and show how energy moves from one trophic level to the next. It is 4 of 4 in the series titled "Energy Pyramids." [5:04]

Explains how energy flows in ecosystems. Energy enters via producers through photosynthesis or chemosynthesis. Producers and consumers release the energy from food through cellular respiration. An explanation of gross primary...

This lesson will review the difference between autotrophs and heterotrophs, and show how both play important roles in a food web. It is 4 of 4 in the series titled "Autotrophs vs. Heterotrophs." [1:21]