One of the most important things that anyone can understand about nature is how everything is connected. Once this fundamental concept is established, it creates a perfect environment for children to act in a mindful way in the environment, and in contact with other people.

Although there are many methods for teaching about natural connectivity, small ecosystems tend to be a favorite. This particular project hails from a homeschooling website. The site outlines the entire process necessary for building a pop bottle ecosystem, including step-by-step instructions (with photographs), and excerpts on how to teach about the ecosystem. There is also an "additional layers" section that discusses methods of tying this project in with other subjects such as writing, reading, and responsibility.

Also, the example ecosystem includes goldfish! Who doesn't love goldfish?