Evolucion humano

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Species of modern humans populated many parts of the world much later. For instance, people first came to Australia probably within the past 60, years and to the Americas within the past 30, years or so. The beginnings of agriculture and the rise of the first civilizations occurred within the past 12, years. Paleoanthropology is the scientific study of human evolution. Paleoanthropology is a subfield of anthropology, the study of human culture, society, and biology.

The field involves an understanding of the similarities and differences between humans and other species in their genes, body form, physiology, and behavior. Paleoanthropologists search for the roots of human physical traits and behavior. They seek to discover how evolution has shaped the potentials, tendencies, and limitations of all people. For many people, paleoanthropology is an exciting scientific field because it investigates the origin, over millions of years, of the universal and defining traits of our species.

However, some people find the concept of human evolution troubling because it can seem not to fit with religious and other traditional beliefs about how people, other living things, and the world came to be. Nevertheless, many people have come to reconcile their beliefs with the scientific evidence. Early human fossils and archeological remains offer the most important clues about this ancient past.

These remains include bones, tools and any other evidence such as footprints, evidence of hearths, or butchery marks on animal bones left by earlier people.

Usually, the remains were buried and preserved naturally. They are then found either on the surface exposed by rain, rivers, and wind erosion or by digging in the ground. By studying fossilized bones, scientists learn about the physical appearance of earlier humans and how it changed.

Bone size, shape, and markings left by muscles tell us how those predecessors moved around, held tools, and how the size of their brains changed over a long time. Archeological evidence refers to the things earlier people made and the places where scientists find them.

By studying this type of evidence, archeologists can understand how early humans made and used tools and lived in their environments.

The process of evolution involves a series of natural changes that cause species populations of different organisms to arise, adapt to the environment, and become extinct. All species or organisms have originated through the process of biological evolution.

In animals that reproduce sexually, including humans, the term species refers to a group whose adult members regularly interbreed, resulting in fertile offspring -- that is, offspring themselves capable of reproducing. Scientists classify each species with a unique, two-part scientific name. In this system, modern humans are classified as Homo sapiens.

Evolution occurs when there is change in the genetic material -- the chemical molecule, DNA -- which is inherited from the parents, and especially in the proportions of different genes in a population.

Genes represent the segments of DNA that provide the chemical code for producing proteins. Information contained in the DNA can change by a process known as mutation. The way particular genes are expressed — that is, how they influence the body or behavior of an organism -- can also change. Evolution does not change any single individual. Instead, it changes the inherited means of growth and development that typify a population a group of individuals of the same species living in a particular habitat.

Parents pass adaptive genetic changes to their offspring, and ultimately these changes become common throughout a population. As a result, the offspring inherit those genetic characteristics that enhance their chances of survival and ability to give birth, which may work well until the environment changes. Over time, genetic change can alter a species' overall way of life, such as what it eats, how it grows, and where it can live.

Learn more about how human evolution factored into the history of evolutionary thought. Find additional lessons, activities, videos, and articles that focus on human evolution. Subscribe to our newsletter. Email Facebook Twitter. EN in English. Al mismo tiempo, el Homo neanderthalensis y el Homo erectus vivieron en otras partes del Viejo Mundo.

More Details Evo Examples Teaching Resources Learn more about how human evolution factored into the history of evolutionary thought.

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Estos son algunos de los acontecimientos importantes de la historia de la especie humana, con sus fechas aproximadas, que reflejan los datos disponibles en la actualidad:. Learn more about how human evolution factored into the history of evolutionary thought. Find additional lessons, activities, videos, and articles that focus on human evolution. Subscribe to our newsletter. Email Facebook Twitter.

EN in English. Al mismo tiempo, el Homo neanderthalensis y el Homo erectus vivieron en otras partes del Viejo Mundo. Journal of Anatomy. ISSN PMC PMID Consultado el 8 de marzo de PLOS Genetics 7 3 : e The American Journal of Human Genetics 68 2 : The American Journal of Human Genetics , 92 3 : Science , : - doi Nature : Apr de ISBN Australopithecus garhi : a new species of early hominid from Ethiopia.

Science , 23 : Journal of Archaeological Science 27 Archivado desde el original el 7 de mayo de Consultado el 18 de noviembre de A new skull of early Homo from Dmanisi, Georgia". Science , : La especie elegida. Ediciones Temas de Hoy, Madrid, pp. Nature Science , : doi L'Anthropologie , 89 1 — A test using the Narmada fossil from central India». En: M. Petraglia, y B. Allchin eds. Evolution and history of human populations in South Asia : New York: Springer Press.

En: A. Sankhyan y V. Rao eds. New Delhi: Allied Publishers. Manchester, United Kingdom. National Geographic News. Rink; S. Schwarcz; G. Curtis; A. Suprijo y Widiasmoro. Consultado el 11 de abril de Journal of Human Evolution , 57 5 : Evolutionary Anthropology: Issues, News and Reviews Nature , : Journal of Human Evolution , 37 :