Heart Blood vessels. (Arteries, Capillaries, and Veins)
All life on Earth, at heart use a membrane that separates their organism from its environment. For it to stay alive, the organism takes in important materials for making energy, while also shuttling out toxic substances such as waste products. In this regard, water is essential simply because it's a liquid at Earth-like temperatures.
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<span>Homeostasis is the ability to maintain a constant internal environment in response to environmental changes</span>
