pedernal

pedernal

A kind of hard, rock with a glassy opaque appearance. It was a favorite raw material for many prehistoric humans for the manufacture of tools such as knives and scraping implements.

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분야/도메인: 인류학
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Company: Palomar College
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enfermedad endémica

인류학; 자연 인류학

A disease that remains at a more or less constant frequency of affected individuals in a population all of the time. Examples: hypertension, tooth decay, and malaria.

polimorfismo

인류학; 자연 인류학

A genetic trait controlled by more than one allele, each of which has a frequency of 1% or greater in the population gene pool. See balanced polymorphism.

termoluminiscencia (TL)

인류학; 자연 인류학

A radiometric dating method based on the fact that trace amounts of radioactive atoms, such as uranium and thorium, in some kinds of rock, soil, and clay produce constant low ...

modelo de asimilación

인류학; 자연 인류학

A hypothesis to explain the origin of modern Homo sapiens. It proposes that the first modern humans evolved in Africa, but when they migrated into other regions they did not ...

potasio-argón

인류학; 자연 인류학

A radiometric dating method based on the fact that potassium-40 in volcanic rock decays into argon-40 and calcium-40 at a known rate. The half-life of potassium-40 is ...

trisomía 21

인류학; 자연 인류학

A genetically inherited form of mental retardation usually resulting from the inheritance of an extra autosome 21. Down syndrome individuals also typically are short and stocky in ...

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Día de Canadá

El Día de Canadá se celebra la unión de las tres colonias británicas (Nueva Escocia, Nueva Brunswick, y la Provincia de Canadá) que hoy en día forman ...