* All matter tends toward more disorganized states. Living systems require a continuous input of energy.   * The energy for life primarily comes from the sun.   * The chemical bonds of food molecules contain energy.   * The distribution and abundance of organisms in ecosystems are limited by the availability of matter and energy.   * As matter and energy flows through the levels of life, matter and energy are conserved.  (NSES, 1996)

This "learning tool" is called Food Chain.   One of the most innovative science education companies is Explorelearning.com, they call their simulations, Gizmos. They are a subscription site, but they allow you to see this Gizmo for 5 minutes.   Shockwave is required.

The name of this "learning tool" is called Photosynthesis. The elegant and conceptually clean animations of John Kyrk will lead your students through the fascinating world of the energy source for most life on the planet Earth. Just click the small green arrow on the left side to advance the animations. The work of John Kyrk is really incredible, please visit his web site to see more biology related visuals!

This "learning tool" is called Rabbit Population by Season.   One of the most innovative science education companies is Explorelearning.com, they call their simulations, Gizmos. They are a subscription site, but they allow you to see this Gizmo for 5 minutes.   Shockwave is required.

NASA continues to be a leader in science education! This "learning tool" is called the "Earth Observatory: Data & Images". Here you can explore data sets in a very visual way. Scroll your mouse over Atmosphere, Oceans, Land, Life on Earth, and Heat & Energy to see the specific variables you can choose. Select the variable and then build an animation to see it change over time. In LAND , you might want to select Landcover Classification to see ecosystems over time.

This "learning tool" is an applet which clearly explains the predator prey relationship in ecology. The name of this interactive is Predator and Prey, it uses the classic relationship of the Canadian Lynx and the Snowshoe rabbit. On the second page make sure you hit the "Graph" button to get to the interactive graph. This tool is brought to us by McGraw Hill.

NASA has always been a leader in science education. The name of this "learning tool" is called Predator-Prey.  This simulation is conceptually clean and clear. From  NASA CT Science Interactives. Thanks.