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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Industry/Domain: Anthropology
Category: Physical anthropology
Company: Palomar College
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Industry/Domain: Anatomy Category: Cytology

células

Las células son la unidad funcional básica de la vida (todos los organismo están compuestos por ellos). Fueron descubiertos por Robert Hooke en 1665. ...