Life colonising a rocky peak
Scientific classification
(unranked) Life
Domains and Kingdoms
Archaea
Bacteria
Eukaryota
Animalia
Fungi
Plantae
Protista
Look up life, living in Wiktionary, the free dictionary.Life is the characteristic
state of organisms and individual cells. This is how they thrive. Properties
common to the known organisms found on Earth (plants, animals, fungi, protists,
archaea and bacteria) are that they are carbon-and-water-based, are cellular
with complex organization, undergo metabolism, possess a capacity to grow,
respond to stimuli, reproduce and, through natural selection, adapt in succeeding
generations.
An entity with the above properties is considered to be an organism. However, not every definition of life considers all of these properties to be essential. For example, the capacity for descent with modification is often taken as the only essential property of life. This definition notably includes viruses, which do not qualify under narrower definitions as they are acellular and do not metabolise. Broader definitions of life may also include theoretical non-carbon-based life and other alternative biology.
Although it cannot be pinpointed exactly, evidence suggests that life on
Earth has existed for about 3.7 billion years . Currently the entire Earth
contains about 75 billion tons of biomass (life), which lives within various
environments within the biosphere.
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