State of Matter
Life
Ranunculus occidentalis. Photo: (c) Brent Miller, some rights reserved (CC BY-NC-ND)
Life is a characteristic that distinguishes physical entities that do have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as inanimate. Various forms of life exist, such as plants, animals, fungi, protists, archaea, and bacteria. The criteria can at times be ambiguous and may or may not define viruses, viroids, or potential artificial life as…
- Humboldt Life
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