Grade 3 Science: Topic - Ecology; Effects on Ecosystems / At the end of this book you will learn about the science of ecosystems otherwise called as the "homes" of organisms. Read about the importance of maintaining balance within ecosystems and what are some of the reasons this delicate balance is disrupted. With this information known it is expected that you will be empowered to do your share in protecting the natural environment. This is most definitely an informative read.