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Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased (they have died) 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. Biology is the science that studies life. There is currently no consensus regarding the definition of life. One popular definition is that organisms are open systems that maintain homeostasis, are composed of cells, have a life cycle, undergo metabolism, can grow, adapt to their environment, respond to stimuli, reproduce and evolve. Other definitions sometimes include non-cellular life forms such as viruses and viroids. Abiogenesis is the natural process of life arising from non-living matter, such as simple organic compounds. The prevailing scientific hypothesis is that the transition from non-living to living entities was not a single event, but a gradual process of increasing complexity. 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 Earth 4. 54 billion years ago. The earliest known life forms are microfossils of bacteria.

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    Animated Give Christmas Holidays Abroad
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    Donations Giveaway Wreath Us Holidays
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    Winter Sun Holidays Holiday Websites
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    Boxes Goody Budget Holidays Endowment
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    Low Cost Holidays New Years
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    Wallpaper Grants Benevolence Budget Holidays
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    Feb Holidays 2017 Bookable Holidays
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    Holiday Package Deals Spring Greetings
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    Family American Holiday Calendar Discount
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    Travel Holidays Gift Bargain Empower016
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    Valentine Greetings Inclusive Holidays Donor
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    Dong Letter Natural Endowment Greeting
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    Wholesale Sales Pollinator Gift Card
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    Peach Gift Wrap Ceremony Empower
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