Life
Evidence suggest that life on Earth has existed for about 3.7 billion years. All known life forms share fundamental molecular mechanisms, and based on these observations, theories on the origin of life attempt to find a mechanism explaining the formation of a primordial single cell organism from which all life originates. There are many different hypotheses regarding the path that might have been taken from simple organic molecules via pre-cellular life to protocells and metabolism.
Although there is no universal agreement on the definition of life, scientists generally accept that the biological manifestation of life is characterized by organization, metabolism, growth, adaptation, response to stimuli and reproduction. Life may also be said to be simply the characteristic state of organisms. In biology, the science of living organisms, "life" is the condition which distinguishes active organisms from inorganic matter, including the capacity for growth, functional activity and the continual change preceding death.
A diverse array of living organisms (life forms) can be found in the biosphere on Earth, and properties common to these organisms—plants, animals, fungi, protists, archaea, and bacteria—are a carbon- and water-based cellular form with complex organization and heritable genetic information. Living organisms undergo metabolism, maintain homeostasis, possess a capacity to grow, respond to stimuli, reproduce and, through natural selection, adapt to their environment in successive generations. More complex living organisms can communicate through various means.
Read more about this topic: Natural Environment
Famous quotes containing the word life:
“Every sign by itself seems dead. What gives it life?—In use it is alive. Is life breathed into it there?—Or is the use its life?”
—Ludwig Wittgenstein (1889–1951)
“... all my life I’ve been terrible at remembering people’s names. I once introduced a friend of mine as Martini. Her name was actually Olive.”
—Tallulah Bankhead (1903–1968)
“All that a pacifist can undertake—but it is a very great deal—is to refuse to kill, injure or otherwise cause suffering to another human creature, and untiringly to order his life by the rule of love though others may be captured by hate.”
—Vera Brittain (1896–1970)