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What is the definition of carbon dating

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Modern definitions are more complex, with input from a diversity of scientific disciplines.

Biophysicists have proposed many definitions based on chemical systems; there are also some living systems theories, such as the Gaia hypothesis, the idea that the Earth itself is alive.

This characteristic exhibits all or most of the following traits: Others take a systemic viewpoint that does not necessarily depend on molecular chemistry.

One systemic definition of life is that living things are self-organizing and autopoietic (self-producing).

Cells reproduce through a process of cell division, in which the parent cell divides into two or more daughter cells.

Though currently only known on Earth, life need not be restricted to it, and many scientists speculate in the existence of extraterrestrial life.

Living systems are open self-organizing living things that interact with their environment.

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.

The earliest known life forms are microfossils of bacteria.

In July 2016, scientists reported identifying a set of 355 genes thought to be present in the last universal common ancestor (LUCA) of all living organisms.