A closed system like a nuclear submarine differs from a terrarium in a few key ways.
Firstly, a nuclear submarine is designed to be completely self-sufficient and operate autonomously for extended periods of time without any external inputs. This means that it must generate its own power, produce its own oxygen, and recycle its own waste. In contrast, a terrarium is typically an enclosed ecosystem that requires external inputs such as light and water to sustain the plants and animals inside.
Secondly, a nuclear submarine is designed to be isolated from the external environment in order to maintain its stealth and security. This means that it is equipped with advanced technology to detect and deter potential threats from the outside world. In contrast, a terrarium is designed to allow the exchange of air and other materials between the inside and outside environment, so that the plants and animals inside can thrive.
Finally, a nuclear submarine is designed for a specific purpose, such as conducting military operations or scientific research, and is operated by a highly trained crew with specialized skills. In contrast, a terrarium is typically designed for aesthetic or educational purposes and can be maintained by people with a wide range of backgrounds and skill levels.