Hi, I'm Emerald Robinson, and in this "What Is" video, we're going to investigate earth's ecosystems. An ecosystem is a community of living things interacting with the non-living parts of their environment. There are two primary parts of an ecosystem. The biotic part is made of all of the living things, like plants and animals, fungi, and bacteria and viruses. The abiotic part is made of non-living things, like rocks and minerals, water, and energy. Ecosystems can be almost any size. W