In 1952, chemists Harold Urey and Stanley miller mixed ammonia, methane, and hydrogen in a closed container, zapped it with electrical sparks, and found that they had created many amino acids.
What are Amino Acids?
Organic substances known as amino acids have both amino and carboxylic acid functional groups. Although there are hundreds of different amino acids in nature, proteins, which are made up of alpha-amino acids, are by far the most common.
According to the positions of the primary structural functional groups, amino acids can be categorized.
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Architecture, Psychology, Astronomy, Agriculture, Arts, Medicine and Language.
Answer:
As the oldest town in Texas, Nacogdoches is home to plenty of history. ... Around 1700, the Spanish began establishing missions in and around Nacogdoches. ... Nacogdoches University served as a hospital for two years during this period.
Explanation:
La respuesta correcta a esta pregunta abierta es la siguiente.
Las características en común tuvieron las primeras grandes civilizaciones que se desarrollaron posterior a la Era de los metales fue el uso de herramientas de bronce con las que pudieron crear utensilios para sus actividades diarias y también fabricar armas más letales para usar en combate.
Podemos ubicar por ejemplo, a la civilización de Sumeria, aproximadamente 4,000 años antes de cristo, y su desarrollo tecnológico para trabajar con el bronce y tallar herramientas que fueron utilizadas en la construcción de grandes e imponentes Zigurats en reconocidas ciudades-estado como Ur, Uruk, Lagash, y Kish.
