Dating fossils methods

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Biology definition of organism: a living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis. An organism refers to a living thing that has an organized structure, can react to stimuli , reproduce, grow , adapt, and maintain homeostasis. An organism would, therefore, be any animal , plant , fungus , protist , bacterium , or archaeon on earth. These organisms may be classified in various ways. One of the ways is by basing upon the number of cell s that make it up.
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Radiometric dating

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Dating Fossils in the Rocks | National Geographic Society

Prehistoric humans — perhaps Neanderthals or another lost species — occupied what is now California some , years ago, a team of scientists reported on Wednesday. The bold and fiercely disputed claim, published in the journal Nature , is based on a study of mastodon bones discovered near San Diego. If the scientists are right, they would significantly alter our understanding of how humans spread around the planet. The earliest widely accepted evidence of people in the Americas is less than 15, years old. Genetic studies strongly support the idea that those people were the ancestors of living Native Americans, arriving in North America from Asia.
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Sedimentary Rocks Formation and Fossils

Lake Turkana has a geologic history that favored the preservation of fossils. Scientists suggest that the lake as it appears today has only been around for the past , years. The current environment around Lake Turkana is very dry. Over the course of time, though, the area has seen many changes.
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The potassium-argon K-Ar isotopic dating method is especially useful for determining the age of lavas. Developed in the s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale. Potassium occurs in two stable isotopes 41 K and 39 K and one radioactive isotope 40 K.
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