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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.

However, many other biological definitions have been proposed, and there are some borderline cases of life, such as viruses.

Eventually new groups and categories of life were discovered, such as cells and microorganisms, forcing dramatic revisions of the structure of relationships between living organisms.

Properties common to all organisms include the need for certain core chemical elements to sustain biochemical functions.

Life on Earth first appeared as early as 4.28 billion years ago, soon after ocean formation 4.41 billion years ago, and not long after the formation of the Earth 4.54 billion years ago.

Cells are sometimes considered the smallest units and "building blocks" of life.

There are two kinds of cells, prokaryotic and eukaryotic, both of which consist of cytoplasm enclosed within a membrane and contain many biomolecules such as proteins and nucleic acids.

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