Heartland, Organic, & Rimland
The stages a country goes through are its birth, its maturity phase, and its death. A mature state has a larger population, with a nation, infrastructure, and healthcare system, and requires more land in order to remain stable.
Just as organisms have organ systems to carry out functions, states also have internal organizations that complete tasks. A state's infrastructure supplies materials in a similar fashion to our body's circulatory system, while the government can be thought of as similar to our brain by dictating the actions of the state.
As in a complex organism, the loss of the productivity of a few cells does not harm the being significantly, but should an entire tissue or organ group be rendered inoperable, the organism as a whole can be expected to fail.
Compare and Contrast
The Organic Theory does not postulate that a certain piece of land, if occupied, would allow its holder to control the world. It rather tries to explain how states run, and compares them to living things.