I think I have learn lots of things about ecosystem. In the begining we just knid of getting the idea about what ecosystem is. Ecosystem include living things (Biotic) and nonliving things (Abiotic). During the middle part of the chapter we have learn about Interaction Between Living Things is about Producers, Consumers and Decomposers. Producers, Consumers and Decomposers is the three categories 

how organism get their energy, it also include Competition, Cooperation, Predation. Symbiosis is a close relationship which have three type Mutualism, Parasitism and Commensalism. We also get to know new word such as Niche which mean a role or position a species has in its environment and other difficult words.