One treats the work as a tedious chore while the other turns it into a game to see how fast he/she can make each unit and achieves flow in the process. I can never read all the books I want; I can never be all the people I want and live all the lives I want.

Hypotheses on the origin of life attempt to explain the formation of a universal common ancestor from simple organic molecules via pre-cellular life to protocells and metabolism. At the end of the 20th century, based upon insight gleaned from the gene-centered view of evolution, biologists George C. The inert components of an ecosystem are the physical and chemical factors necessary for life—energy (sunlight or chemical energy), water, heat, atmosphere, gravity, nutrients, and ultraviolet solar radiation protection. The individual members of a colony are capable of surviving on their own, whereas the members of a true multi-cellular organism have developed specialisations, making them dependent on the remainder of the organism for survival. This specialisation allows multicellular organisms to exploit resources more efficiently than single cells.These include carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur—the elemental macronutrients for all organisms. Williams, Richard Dawkins, and David Haig, among others, concluded that if there is a primary function to life, it is the replication of DNA and the survival of one's genes. Empedocles (430 BC) argued that everything in the universe is made up of a combination of four eternal "elements" or "roots of all": earth, water, air, and fire. However advanced it might be, an organism is still driven by the same basic needs for survival and reproduction.

Fossils are the preserved remains or traces of animals, plants, and other organisms from the remote past.

Small red dwarfs have the opposite problem, with a smaller habitable zone that is subject to higher levels of magnetic activity and the effects of tidal locking from close orbits. Though scientists have intensively studied life on Earth, defining life in unequivocal terms is still a challenge. This account is consistent with teleological explanations of life, which account for phenomena in terms of purpose or goal-directedness.

Viruses have been classed into "species" based on their genetics, but many aspects of such a classification remain controversial. Life: The Game on Poki is the best way to experience an entire journey, from birth to death, in game form!These are physical and emotional needs, which, when enough of them are met, ensure the health of the individual, maximising his or her ability to achieve meaning in life. Cells reproduce through a process of cell division in which the parent cell divides into two or more daughter cells.

The best evidence of life outside of Earth is are nucleic acids that have been found in certain types of meteorites. Response to stimuli: such as the contraction of a unicellular organism away from external chemicals, the complex reactions involving all the senses of multicellular organisms, or the motion of the leaves of a plant turning toward the sun ( phototropism), and chemotaxis. The Cynical life rejects conventional desires for wealth, power, health, and fame, by being free of the possessions acquired in pursuing the conventional. Shannon's information, Bernal's biopoiesis and Bernoulli distribution as pillars for building a definition of life". In the late 1740s, Carl Linnaeus introduced his system of binomial nomenclature for the classification of species.

Cell theory was formulated by Henri Dutrochet, Theodor Schwann, Rudolf Virchow and others during the early nineteenth century, and subsequently became widely accepted. The meaning of life pertains to the significance of living or existence in general, and is sought through the question "What is the meaning of life? Another with the same illness interviewed in our local newspaper said, “My life is a mission to help other sufferers. I believe life at its best is spirit: it is active, sentient, feeling, thinking, purposive, valuing, social, other-respecting, relating, and caring. The application of hylomorphism to biology was important to Aristotle, and biology is extensively covered in his extant writings.