Evolution radiometric dating fossils

What is impressive is not just the numbers but also the incredible heterogeneity in size, shape, and way of life—from lowly bacteria, measuring less than a thousandth of a millimetre in diameter, to stately sequoias, rising 100 metres (300 feet) above the ground and weighing several thousand tons; from bacteria living in hot springs at temperatures near the boiling point of water to fungi and algae thriving on the ice masses of Antarctica and in saline pools at −23 °C (−9 °F); and from giant tube worms discovered living near hydrothermal vents on the dark ocean floor to spiders and larkspur plants existing on the slopes of Mount Everest more than 6,000 metres (19,700 feet) above sea level.

In this Darwin and other 19th-century biologists found compelling evidence for biological evolution in the comparative study of living organisms, in their geographic distribution, and in the fossil remains of extinct organisms.For a discussion of human evolution, the articles genetics, human and heredity.Specific aspects of evolution are discussed in the articles coloration and mimicry.Applications of evolutionary theory to plant and animal breeding are discussed in the articles plant breeding and animal breeding.An overview of the evolution of life as a major characteristic of Earth’s history is given in community ecology: Evolution of the biosphere.

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