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Life on Earth probably arose between 3.8 and 4.1 billion years ago.

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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.Another theory is that life is the property of ecological systems, and yet another is elaborated in complex systems biology, a branch or subfield of mathematical biology.A great advantage using price guns can offer merchants is the ability to put your store name and logo on every product you sell.Using labeling tools with custom printed labels is the most efficient and least inexpensive way to go about this.Biology is the primary science concerned with the study of life, although many other sciences are involved. The current definition is that organisms maintain homeostasis, are composed of cells, undergo metabolism, can grow, adapt to their environment, respond to stimuli, and reproduce.

However, many other biological definitions have been proposed, and there are some borderline cases, such as viruses.Throughout history, there have been many attempts to define what is meant by "life" and many theories on the properties and emergence of living things, such as materialism, the belief that everything is made out of matter and that life is merely a complex form of it; hylomorphism, the belief that all things are a combination of matter and form, and the form of a living thing is its soul; spontaneous generation, the belief that life repeatedly emerges from non-life; and vitalism, a now largely discredited hypothesis that living organisms possess a "life force" or "vital spark".Modern definitions are more complex, with input from a diversity of scientific disciplines.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 "living".This way, the shopper doesn’t understand what the letters mean and will simply ignore them thinking they are an item identification code of some kind.